milli-

Tiny measurement prefix

Milli- is a prefix meaning one-thousandth of a unit: a millimeter is a thousandth of a meter, a millisecond a thousandth of a second, a milligram a thousandth of a gram.

The prefix derives from Latin mille (thousand) and appears throughout metric measurement.

In casual speech, milli- sometimes just suggests something very small: Give me a millisecond to think.

scientific

metric

Standard of measurement

  • SIUniversal measurement framework
  • prefixRoot-modifying front element
  • unitIndividual part or measure

precision · calibration · instrument · scale · decimal · thousandth · fraction · subdivision · quantification · laboratory

measurement

milliampere

Current measurement unit

milliohm · millicurie · millirem

colloquial

millennial

Concerning thousand-year cycles

Milli Vanilli · Millie · millinery · milliamp

Opposites
metric magnitude

milli-kilo-

Thousand-unit prefix

mega- · giga- · tera- · peta- · hecto-

Phrases
Family

millennium, millimeter, millipede, millisecond, milliliter, milligram, millimetre, millibar, millivolt

Familiarity
Top 500,000
Profile
Known to kids · Used worldwide · Timeless · Abstract · Rated G