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WordReference Random House Unabridged Dictionary of American English © 2024si (sē),USA pronunciation n. [Music.]- Music and Dancethe syllable used for the seventh tone of a scale and sometimes for the tone B.
SI, - Weights and Measures, PhysicsSee International System of Units.
Si, [Symbol, Chem.]- Chemistrysilicon.
S.I., - Place NamesSandwich Islands.
- Place NamesStaten Island.
Collins Concise English Dictionary © HarperCollins Publishers:: si /siː/ n - a variant of te
ˈmet•ric ˌsys•tem, n. [countable]- Weights and Measuresa decimal system of weights and measures, universally used in science, and the official system of measurement in many countries:the metric system of milliliters, centiliters, and liters.
WordReference Random House Unabridged Dictionary of American English © 2024met′ric sys′tem, - Weights and Measuresa decimal system of weights and measures, adopted first in France but now widespread, universally used in science, mandatory for use for all purposes in a large number of countries, and favored for use in most (as in the U.S.). The basic units are the meter (39.37 inches) for length and the gram (15.432 grains) for mass or weight. Derived units are the liter (0.908 U.S. dry quart, or 1.0567 U.S. liquid quart) for capacity, being the volume of 1000 grams of water under specified conditions;
the are (119.6 square yards) for area, being the area of a square 10 meters on a side;
and the stere (35.315 cubic feet) for volume, being the volume of a cube 1 meter on a side, the term "stere,'' however, usually being used only in measuring firewood. Names for units larger and smaller than these are formed from the above names by the use of the following prefixes:kilo-,1000;
hecto-, 100;
deka-, 10;
deci-, 0.1;
centi-, 0.01;
milli-, 0.001. To these are often added:tera-,one trillion;
giga-, one billion;
mega-, one million. With the addition of basic physical units it is now officially known by the French name Le Système International d'Unités (abbreviation SI) or in English as the International System of Units.
Collins Concise English Dictionary © HarperCollins Publishers:: SI symbol for - Système International (d'Unités)
See SI unit
abbreviation for - NZ South Island
Collins Concise English Dictionary © HarperCollins Publishers:: Si /ʃiː/, Si Kiang n - a variant transliteration of the Chinese name for the Xi
Si the chemical symbol for - silicon
Collins Concise English Dictionary © HarperCollins Publishers:: Xi, Hsi, Si /ʃiː/ n - a river in S China, rising in Yunnan province and flowing east to the Canton delta on the South China Sea: the main river system of S China. Length: about 1900 km (1200 miles)
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