Definition of si Si

/siˈ/ - [see] -

We found 8 definitions of si from 6 different sources.

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What does si mean?

WordNet

WordNet by Princeton University

Noun

si - a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors
  silicon, Si, atomic number 14
  chemical element, element the most favorable environment for a plant or animal; "water is the element of fishes"
  semiconducting material, semiconductor a substance as germanium or silicon whose electrical conductivity is intermediate between that of a metal and an insulator; its conductivity increases with temperature and in the presence of impurities
  silicone, silicone polymer any of a large class of siloxanes that are unusually stable over a wide range of temperatures; used in lubricants and adhesives and coatings and synthetic rubber and electrical insulation
  clay United States politician responsible for the Missouri Compromise between free and slave states (1777-1852)
  feldspar, felspar any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium
  granite something having the quality of granite (unyielding firmness); "a man of granite"
  quartz a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities
si - a complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (candela); "Today the United States is the only country in the world not totally committed to the Systeme International d'Unites"
  Systeme International d'Unites, Systeme International, SI system, SI, SI unit, International System of Units, International System
si - the syllable naming the seventh (subtonic) note of any musical scale in solmization
  ti, te
= synonym
= antonym
= related word

Wiktionary Wiktionary dictionary logo

  • si (Noun)
    A syllable used in solfège to represent the seventh note of a major scale .

Webster DictionaryWebster's Unabridged Dictionary 📘

  • si
    A syllable applied, in solmization, to the note B; more recently, to the seventh tone of any major diatonic scale. It was added to Guido's scale by Le Maire about the end of the 17th century.

OmegaWiki DictionaryOmegaWiki Dictionary Ω

  • si
    A complete system of standardized units and prefixes for fundamental quantities of length, time, volume, mass, and so on.

Chambers DictionaryChamber's 20th Century Dictionary 📕

  • si
    sē, n. the syllable used for the seventh tone of the scale, or the leading tone

Part of speech

🔤
  • si, noun, singular of sis.

Pronunciation

Word frequency

Si is...

60% Complete
Very rare
Rare
Normal
Common
Very Common
66% Complete
Rare
Normal
Common

Sign Language

si in sign language
Sign language - letter S Sign language - letter S Sign language - letter I Sign language - letter I