[ sins ]
/ sɪns /



continuously from or counting from: It has been warm since noon.
between a past time or event and the present: There have been many changes since the war.


Origin of since

1400–50; late Middle English syns, sinnes (adv.) thereupon, afterwards, Middle English sithenes (adv. and conjunction) afterwards, from (the specified time), because, equivalent to sithen after that, since (Old English siththan, orig. sīth thām after that; see sith) + -es -s1

Synonym study

8. See because.

Usage note

8. See as1. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for since


/ (sɪns) /


during or throughout the period of time aftersince May it has only rained once

conjunction (subordinating)

(sometimes preceded by ever) continuously from or starting from the time whensince we last met, important things have happened
seeing that; becausesince you have no money, you can't come


since that timehe left yesterday and I haven't seen him since

Word Origin for since

Old English sīththan, literally: after that; related to Old High German sīd since, Latin sērus late


See ago
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 since



early 15c., synnes, from sithenes "since," from sithen (plus adverbial genitive -es), from Old English siððan "afterward, from now on, hereafter, further, later, as soon as, after that," originally sið ðan "after that," from sið "after" (see sith) + ðan, weakened form of ðam, dative of ðæt (see that).

As a conjunction from late 14c.; as a preposition from 1510s; "from the time when," hence "as a consequence of the fact that." Modern spelling replaced syns, synnes 16c. to indicate voiceless final -s- sound. Since when? often expressing incredulity, is from 1907.

Online Etymology Dictionary, © 2010 Douglas Harper

Idioms and Phrases with since


see greatest thing since sliced bread.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.