micro Meaning in the Cambridge English Dictionary
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Meaning of “micro” in the English Dictionary

"micro" in British English

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micronoun [C]

uk   /ˈmaɪ.krəʊ/  us   /-kroʊ/ (plural micros)
informal for microcomputer


uk   /maɪ.krəʊ-/ /-rə-/  us   /-kroʊ-/

micro prefix (SMALL)

very ​small: a ​microorganism microbiology

micro prefix (MEASUREMENT)

0.000 001 or one ​millionth of the ​statedunit: a ​micrometre a ​microgram
(Definition of micro from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"micro-" in American English

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 us   /ˌmɑɪ·kroʊ, ˌmɑɪ·krə/
very ​small: a microbrewery
(Definition of micro- from the Cambridge Academic Content Dictionary © Cambridge University Press)

"micro-" in Business English

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uk   us   /maɪkrəʊ-/
very ​small: microlender micromarket microtechnology
MEASURES 1,000,000th of the ​statedunit: a microsecond

micronoun [C]

uk   us   /ˈmaɪkrəʊ/ (plural micros) old-fashioned
IT →  microcomputer


uk   us   /ˈmaɪkrəʊ/
very ​small, or at the ​lowestlevel: The ​program helps to ​support or set up ​bankslending to micro ​enterprises and ​smallbusiness. The ​company has a 20% ​share in the ​market for mini or micro ​cars. These matters are decided at the micro ​level of ​individualfirms.
(Definition of micro- from the Cambridge Business English Dictionary © Cambridge University Press)
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“micro” in Business English

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