Standard Lemma guide

au

adj · name · noun · 18 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.

  • CMU ARPABET: OW1 Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

adj

Meaning 1

Initialism of almost uncirculated.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of, initialism, not-comparable

Topics: hobbies, lifestyle, numismatics

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

name

Meaning 2

Initialism of African Union.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of, initialism

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

name

Meaning 3

Initialism of Age of Ultron.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of, initialism

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

name

Meaning 4

A language spoken in Sandaun Province, Papua New Guinea.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

name

Meaning 5

A surname.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

6

noun

Meaning 6

Abbreviation of atomic unit.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

7

noun

Meaning 7

Abbreviation of arbitrary unit.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

8

noun

Meaning 8

Abbreviation of astronomical unit.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

9

noun

Meaning 9

Abbreviation of Absorbance Units.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

10

noun

Meaning 10

A vowel found in Indic abugidas.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: letter au

Antonyms: none provided

11

noun

Meaning 11

Initialism of alopecia universalis.

Definition source: English Wiktionary via Wiktextract

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

Topics: dermatology, medicine, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

12

noun

Meaning 12

Initialism of astronomical unit.

Definition source: English Wiktionary via Wiktextract

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

Topics: astronomy, metrology, natural-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

13

noun

Meaning 13

Initialism of angstrom unit.

Definition source: English Wiktionary via Wiktextract

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

Topics: metrology, natural-sciences, physical-sciences, physics

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

14

noun

Meaning 14

Initialism of alternate universe or alternative universe.

Definition source: English Wiktionary via Wiktextract

Usage: abbreviation, alt-of, countable, initialism, slang, uncountable

Topics: lifestyle

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

15

noun

Meaning 15

Initialism of arbitrary unit.

Definition source: English Wiktionary via Wiktextract

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

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

16

noun

Meaning 16

Initialism of animal unit.

Definition source: English Wiktionary via Wiktextract

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

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

17

noun

Meaning 17

a unit of length used for distances within the solar system; equal to the mean distance between the Earth and the Sun (approximately 93 million miles or 150 million kilometers)

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: Astronomical Unit

Antonyms: none provided

Broader terms: astronomy unit

18

noun

Meaning 18

a soft yellow malleable ductile (trivalent and univalent) metallic element; occurs mainly as nuggets in rocks and alluvial deposits; does not react with most chemicals but is attacked by chlorine and aqua regia

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: gold, atomic number 79

Antonyms: none provided

Broader terms: noble metal

Narrower terms: 24-karat gold, pure gold, gold dust, green gold, guinea gold

History

Etymology

Borrowed from Cantonese 歐/欧 (ou1) or 區/区 (ou1) (Doublet of Ao), or from German Au.

Across languages

Translations

1 source translations are retained for this English entry.

  • French: SPL — almost uncirculated