Standard Lemma guide

exasecond

noun · 1 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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1

noun

Meaning 1

An SI unit of time equal to 1018 seconds. Symbol: Es. (= 31 709 800 000 years, which is more time than has elapsed in the Universe, that is, since the Big Bang [about 13 800 000 000 years].)

Definition source: English Wiktionary via Wiktextract

Topics: metrology

Examples

  • Holonyms: zettasecond < yottasecond < ronnasecond < quettasecond
  • Meronyms: quectosecond < rontosecond < yoctosecond < zeptosecond < attosecond < femtosecond < picosecond < nanosecond < microsecond < millisecond < centisecond < decisecond < second < decasecond < minute < hectosecond < kilosecond < hour < day < week < megasecond < fortnight < month < year < gigasecond < century < kiloannum, kiloyear, millennium < terasecond < mega-annum, megayear < petasecond < giga-annum, gigayear

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

From exa- + second.