si

[see]

noun Music.

the syllable used for the seventh tone of a scale and sometimes for the tone B.

Origin of si

First recorded in 1720–30; see origin at gamut

Si

Symbol, Chemistry.

silicon.

SI

International System of Units.

S.I.

Sandwich Islands.

Staten Island.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for si

Contemporary Examples of si

Except for nine of them are musical words: do, re, mi, fa, so, la, ti—and si—are musical.
Well, La Ti Da: Stephin Merritt’s Winning Little Words of Scrabble
David Bukszpan
October 11, 2014
Michael Sam has one big advantage over the aging NFL execs who whined to SI.
Michael Sam Is Not a ‘Distraction’
Dave Cullen
February 12, 2014
It was the only SI story Shrake ever wrote that the magazine would not print and Laguerre was embarrassed.
‘The Land of the Permanent Wave’ Is Bud Shrake’s Classic Take on ‘60s Texas
Edwin Shrake
February 2, 2014
With her characteristic fierce energy, Clinton poured herself into the fight, chanting “Si, se puede” at rally after rally.
How Ted Cruz Can Win in 2016
David Frum
October 25, 2013
The SI veteran married singer John Legend in a ceremony in Italy.
Sports Illustrated Swimsuit Model Chrissy Teigen Weds John Legend
Anna Klassen
September 15, 2013

Historical Examples of si

Si sed: "Yas; counted 'em on the wagon, counted 'em off agin, and counted 'em when I made 'em."
Uncles Josh's Punkin Centre Stories
Cal Stewart
Si monumentum requiris, circumspice; it points us back to London.
Howards End
E. M. Forster
"Si———" began Csar, but the protest foundered in his dry throat.
The Manxman
Hall Caine
Si señor, a good padrone are you, and water it will be found for you.
The Treasure Trail
Marah Ellis Ryan
He had hardly been in speaking distance of such women as Si's mother and sisters.
Si Klegg, Book 5 (of 6)
John McElroy

British Dictionary definitions for si

si

noun

music a variant of te

si

the internet domain name for

Slovenia

Si

Si Kiang

noun

a variant transliteration of the Chinese name for the Xi

Si

the chemical symbol for

silicon

SI

symbol for

Système International (d'Unités)See SI unit

abbreviation for

NZ South Island

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for si

"yes" in Italian, Spanish, Portuguese; from Latin sic "so" (see sic).

si in Medicine

Si

The symbol for the elementsilicon

SI

abbr.

Système International (d'Unités) (International System of Units)

si in Science

Si

The symbol for silicon.

silicon

[sĭl′ĭ-kŏn′]

Si

A metalloid element that occurs in both gray crystalline and brown noncrystalline forms. It is the second most abundant element in the Earth's crust and can be found only in silica and silicates. Silicon is used in glass, semiconductors, concrete, and ceramics. Atomic number 14; atomic weight 28.086; melting point 1,410°C; boiling point 2,355°C; specific gravity 2.33; valence 4. See Periodic Table.