Standard Lemma guide

mantissa

noun · 4 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

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  • /mænˈtɪsə/
  • US: Recorded audio is listed in the source snapshot.
  • rhymes with -ɪsə

1

noun

Meaning 1

A minor addition to a text.

Definition source: English Wiktionary via Wiktextract

Usage: obsolete

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

The part of a common logarithm after the decimal point, the fractional part of a logarithm.

Definition source: English Wiktionary via Wiktextract

Topics: mathematics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

The significand; that part of a floating-point number or number in scientific notation that contains its significant digits.

Definition source: English Wiktionary via Wiktextract

Topics: computing, engineering, mathematics, natural-sciences, physical-sciences, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: significand

Antonyms: none provided

4

noun

Meaning 4

the positive fractional part of the representation of a logarithm; in the expression log 643 = 2.808 the mantissa is .808

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: fixed-point part

Antonyms: none provided

Broader terms: fraction

History

Etymology

Borrowed from Latin mantissa, mantīsa, of unknown origin (said by Festus to be a loanword from Etruscan, but it may actually be from Celtic, possibly through Etruscan mediation). Coincidentally, proparoxytone Greek μάντισσα (mántissa) means "female foreteller", as in χαρτομάντισσα (chartomántissa, “cartomancer”) or χειρομάντισσα (cheiromántissa, “chiromancer”).

Across languages

Translations

15 source translations are retained for this English entry.

  • Catalan: mantissa — part of a logarithm after the decimal point
  • Chinese Mandarin: 尾数 (wěishù) — part of a logarithm after the decimal point
  • Czech: mantisa — part of a logarithm after the decimal point
  • Finnish: mantissa — part of a logarithm after the decimal point
  • French: mantisse — part of a logarithm after the decimal point
  • Galician: mantisa — part of a logarithm after the decimal point
  • German: Mantisse — part of a logarithm after the decimal point
  • Hindi: अपूर्णांश (apūrṇāñś) — part of a logarithm after the decimal point
  • Italian: mantissa — part of a logarithm after the decimal point
  • Japanese: 仮数 (kasū) — part of a logarithm after the decimal point
  • Polish: mantysa — part of a logarithm after the decimal point
  • Portuguese: mantissa — part of a logarithm after the decimal point
  • Russian: манти́сса (mantíssa) — part of a logarithm after the decimal point
  • Spanish: mantisa — part of a logarithm after the decimal point
  • Tagalog: sampuambahagi — part of a logarithm after the decimal point