Standard Lemma guide

expansion

noun · 16 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • /ɪkˈspænʃən/
  • US: Recorded audio is listed in the source snapshot.
  • CMU ARPABET: IH0 K S P AE1 N SH AH0 N Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
  • CMU ARPABET 2: IH0 K S P AE1 N CH AH0 N Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

noun

Meaning 1

An act, process, or instance of expanding.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Examples

  • The expansion of metals and plastics in response to heat is well understood.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

An act, process, or instance of expanding.

The fractional change in unit length per unit length per unit temperature change.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Examples

  • Look up the expansion of 1018 steel at stick welding temps and figure out how far this thing's gonna bend once we weld it up.

Meaning relationships

Synonyms: coefficient of thermal expansion

Antonyms: none provided

Broader terms: temperature coefficient

3

noun

Meaning 3

An act, process, or instance of expanding.

A new addition.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Qualifier: building

Examples

  • My new office is in the expansion behind the main building.

Meaning relationships

Synonyms: annex

Antonyms: none provided

4

noun

Meaning 4

An act, process, or instance of expanding.

A product to be used with a previous product.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Examples

  • This expansion requires the original game board.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

noun

Meaning 5

An act, process, or instance of expanding.

That which is expanded; expanse; extended surface.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

6

noun

Meaning 6

An act, process, or instance of expanding.

The operation of steam in a cylinder after its communication with the boiler has been cut off, by which it continues to exert pressure upon the moving piston.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Qualifier: steam engines

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

7

noun

Meaning 7

An act, process, or instance of expanding.

The replacement of a short name (e.g., acronym, initialism, alphanumeric symbol, abbreviation) with the longer name that is synonymous with it, as when spelling out acronyms to ensure clarity for a general audience.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Examples

  • Expansion of acronyms is often helpful for nonexpert readers (anacronyms excluded).

Meaning relationships

Synonyms: none provided

Antonyms: none provided

8

noun

Meaning 8

An act, process, or instance of expanding.

The replacement of a short name (e.g., acronym, initialism, alphanumeric symbol, abbreviation) with the longer name that is synonymous with it, as when spelling out acronyms to ensure clarity for a general audience.

The string of text thus substituted.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Examples

  • The acronym "FNDs" can mean either "functional neurologic disorders" or "focal neurologic deficits", so you'd better use the expansion instead of the acronym, for clarity in this context; readers of this paragraph may not have read, or remember, which definition you used 40 pages earlier.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

9

noun

Meaning 9

An act, process, or instance of expanding.

Ellipsis of expansion pack.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of, countable, ellipsis, uncountable

Topics: video-games

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

10

noun

Meaning 10

An act, process, or instance of expanding.

An increase in the market value of an economy over time.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: economics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

11

noun

Meaning 11

An act, process, or instance of expanding.

Stretching of geometric objects with flat sides.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: geometry, mathematics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

12

noun

Meaning 12

An act, process, or instance of expanding.

The rewriting of an expression as a longer but equivalent sum of terms.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: algebra, mathematics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

13

noun

Meaning 13

the act of increasing (something) in size or volume or quantity or scope

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: enlargement

Antonyms: contraction

Broader terms: increase, step-up

Narrower terms: dilation, dilatation, distention, distension, stretching, inflation, magnification, extension

14

noun

Meaning 14

adding information or detail

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: expanding upon

Antonyms: none provided

Broader terms: increase, step-up

Narrower terms: amplification, elaboration, annotation, annotating, supplementation, subjunction, subjoining

15

noun

Meaning 15

a discussion that provides additional information

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: enlargement, elaboration

Antonyms: none provided

Broader terms: discussion, treatment, discourse

Narrower terms: expatiation, embellishment, embroidery

16

noun

Meaning 16

a function expressed as a sum or product of terms

Definition source: Princeton WordNet 3.0

Examples

  • the expansion of (a+b)^2 is a^2 + 2ab + b^2

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: function, mathematical function, single-valued function, map, mapping

History

Etymology

Borrowed from French expansion, from Latin expānsiō. By surface analysis, expand + -sion.

Across languages

Translations

86 source translations are retained for this English entry.

  • Arabic: تَمَدُّد (tamaddud) — act of expanding
  • Arabic: تَوَسُّع (tawassuʕ) — act of expanding
  • Armenian: ընդարձակում (əndarjakum) — act of expanding
  • Armenian: ծավալում (cavalum) — act of expanding
  • Armenian: ընդլայնում (əndlaynum) — act of expanding
  • Azerbaijani: genişlənmə — act of expanding
  • Azerbaijani: yayılma — act of expanding
  • Azerbaijani: intişar — act of expanding
  • Azerbaijani: yayılış — act of expanding
  • Azerbaijani: ekspansiya — act of expanding
  • Belarusian: расшырэ́нне (rasšyrénnje) — act of expanding
  • Belarusian: пашырэ́нне (pašyrénnje) — act of expanding
  • Belarusian: экспа́нсія (ekspánsija) — act of expanding
  • Bulgarian: разширение (razširenie) — act of expanding
  • Bulgarian: разширяване (razširjavane) — act of expanding
  • Chinese Mandarin: 擴張 /扩张 (kuòzhāng) — act of expanding
  • Chinese Mandarin: 擴大 /扩大 (kuòdà) — act of expanding
  • Chinese Mandarin: 展開 /展开 (zhǎnkāi) — act of expanding
  • Czech: rozšíření — act of expanding
  • Czech: expanze — act of expanding
  • Danish: ekspansion — act of expanding
  • Danish: udvidelse — act of expanding
  • Dutch: expansie — act of expanding
  • Esperanto: ekspansio — act of expanding
  • Finnish: laajentuminen — act of expanding
  • Finnish: laajennus — act of expanding
  • French: expansion — act of expanding
  • German: Expansion — act of expanding
  • Greek: διαστολή (diastolí) — act of expanding
  • Greek: επέκταση (epéktasi) — act of expanding
  • Hungarian: terjeszkedés — act of expanding
  • Irish: leatacht — act of expanding
  • Irish: borrúlacht — act of expanding
  • Italian: espansione — act of expanding
  • Japanese: 拡大 (kakudai) — act of expanding
  • Japanese: 拡張 (kakuchō) — act of expanding
  • Japanese: 展開 (tenkai) — act of expanding
  • Korean: 확장 (hwakjang) — act of expanding
  • Korean: 팽창 (paengchang) — act of expanding
  • Latin: expānsiō — act of expanding
  • Macedonian: проширување (proširuvanje) — act of expanding
  • Macedonian: експанзија (ekspanzija) — act of expanding
  • Malayalam: വിപുലീകരണം (vipulīkaraṇaṁ) — act of expanding
  • Marathi: विस्तार (vistār) — act of expanding
  • Norwegian Bokmål: ekspansjon — act of expanding
  • Norwegian Bokmål: utvidelse — act of expanding
  • Norwegian Nynorsk: ekspansjon — act of expanding
  • Persian: سُپانش (sopâneš) — act of expanding
  • Persian: انبساط (enbesât) — act of expanding
  • Polish: ekspansja — act of expanding
  • Portuguese: expansão — act of expanding
  • Romanian: expansiune — act of expanding
  • Russian: расшире́ние (rasširénije) — act of expanding
  • Russian: экспа́нсия (ekspánsija) — act of expanding
  • Serbo-Croatian: експа̀нзија — act of expanding
  • Serbo-Croatian: ekspànzija — act of expanding
  • Slovak: rozšírenie — act of expanding
  • Slovak: expanzia — act of expanding
  • Slovene: širitev — act of expanding
  • Slovene: ekspanzija — act of expanding
  • Spanish: expansión — act of expanding
  • Swedish: utvidgning — act of expanding
  • Swedish: expansion — act of expanding
  • Tagalog: pagbuklad — act of expanding
  • Tamil: விரிவாக்கம் (virivākkam) — act of expanding
  • Thai: การขยายตัว (gaan kà-yǎai dtua) — act of expanding
  • Ukrainian: розши́рення (rozšýrennja) — act of expanding
  • Ukrainian: експа́нсія (ekspánsija) — act of expanding
  • Ukrainian: поши́рення (pošýrennja) — act of expanding
  • Urdu: تَوَسُّع (tavassu') — act of expanding
  • Bulgarian: разширение (razširenie) — fractional change in unit length per unit length per unit temperature change
  • Finnish: lämpölaajeneminen — fractional change in unit length per unit length per unit temperature change
  • Spanish: expansión — fractional change in unit length per unit length per unit temperature change
  • Spanish: dilatación — fractional change in unit length per unit length per unit temperature change
  • Tagalog: buklad — fractional change in unit length per unit length per unit temperature change
  • Finnish: laajennus — new addition
  • Finnish: lisäosa — new addition
  • Greek: επέκταση (epéktasi) — new addition
  • Russian: пристро́йка (pristrójka) — new addition
  • Swedish: utbyggnad — new addition
  • Swedish: tillbyggnad — new addition
  • Swedish: expansion — new addition
  • Danish: tilføjelse — product to be used with a previous product
  • Finnish: laajennus — product to be used with a previous product
  • Hungarian: kiegészítő — product to be used with a previous product
  • Swedish: tillägg — product to be used with a previous product
Real reading context

expansion in complete knowledge articles