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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/ˈmaɪkɹɒn/
US:Recorded audio is listed in the source snapshot.
rhymes with -aɪkɹɒn
CMU ARPABET:M AY1 K R AA2 N
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
noun
Meaning 1
Synonym of micrometre (“one-millionth of a metre”).
Definition source: English Wiktionary via Wiktextract
2009, Jonathan Amos, (bbc.co.uk) Satellites weigh California water As one spacecraft lurches and drags through the Earth's uneven gravity field, the second follows 210 km behind, measuring changes in their separation to the nearest micron (a thousandth of a millimetre).
Meaning relationships
Synonyms: micrometre
Antonyms: none provided
2
noun
Meaning 2
A very tiny amount.
Definition source: English Wiktionary via Wiktextract
Usage: figuratively
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
3
noun
Meaning 3
Synonym of breve.
Definition source: English Wiktionary via Wiktextract
Topics: human-sciences, linguistics, sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: breve
Antonyms: none provided
4
noun
Meaning 4
a metric unit of length equal to one millionth of a meter
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: micrometer
Antonyms: none provided
Broader terms: metric linear unit
History
Etymology
From French micron, from Ancient Greek μικρόν (mikrón), neuter of μικρός (mikrós, “small”).
From Ancient Greek μικρόν (mikrón), neuter of μικρός (mikrós, “small”).
Across languages
Translations
19 source translations are retained for this English entry.
