Dictionary.com
Thesaurus.com
Synonyms

since

American  
[sins] / sɪns /

adverb

  1. from then till now (often preceded byever ).

    He was elected in 1978 and has been president ever since.

  2. between a particular past time and the present; subsequently.

    She at first refused, but has since consented.

  3. before now; ago.

    long since.


preposition

  1. continuously from or counting from.

    It has been warm since noon.

  2. between a past time or event and the present.

    There have been many changes since the war.

conjunction

  1. in the period following the time when.

    He has written once since he left.

  2. continuously from or counting from the time when.

    He has been busy since he came.

  3. because; inasmuch as.

    Since you're already here, you might as well stay.

since British  
/ sɪns /

preposition

  1. during or throughout the period of time after

    since May it has only rained once

"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

conjunction

  1. (sometimes preceded by ever) continuously from or starting from the time when

    since we last met, important things have happened

  2. seeing that; because

    since you have no money, you can't come

"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

adverb

  1. since that time

    he left yesterday and I haven't seen him since

"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
since Idioms  

Usage

See as 1.

Etymology

Origin of since

First recorded in 1400–50; Late Middle English (adverb) syns, sinnes “thereupon, afterwards,” Middle English (adverb and conjunction) sithenes “afterwards, from (the specified time), because,” equivalent to sithen “after that, since” ( Old English siththan, originally sīth thām “after that”) + -es; sith, -s 1

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Since 2009, when both the Producers Guild and the motion picture academy expanded their best picture nominee slates from five to 10 and adopted a preferential ballot, the PGA winner has gone on to win best picture all but three times.

From Los Angeles Times

However, “One Battle” has prevailed at the major ceremonies since then, winning best picture at the British Academy Film Awards last week and Anderson taking the top honor with the Directors Guild earlier this month.

From Los Angeles Times

The Lakers are 2-3 since the All-Star break.

From Los Angeles Times

Still, a win was far from guaranteed since the Lakers lost to an injury-depleted Phoenix Suns team on Thursday.

From Los Angeles Times

Referencing all the people he's worked with since, he reflected: "The music I made with Amy is the reason any of them know who I am anyway."

From BBC