from then till now (often preceded by ever ): He was elected in 1978 and has been president ever since.
between a particular past time and the present; subsequently: She at first refused, but has since consented.
ago; before now: long since.
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.
in the period following the time when: He has written once since he left.
continuously from or counting from the time when: He has been busy since he came.
because; inasmuch as: Since you're already here, you might as well stay.

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

8. See because.

8. See as1. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To ever since
World English Dictionary
since (sɪns)
1.  during or throughout the period of time after: since May it has only rained once
2.  (sometimes preceded by ever) continuously from or starting from the time when: since we last met, important things have happened
3.  seeing that; because: since you have no money, you can't come
4.  since that time: he left yesterday and I haven't seen him since

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

mid-15c., synnes, from sithenes "since," from sithen (plus adverbial genitive -es), from O.E. siððan "then, later, after that," originally sið ðan "after that," from sið "after" + ðan, weakened form of ðam, dative of ðæt (see that). Modern
spelling replaced syns, synnes 16c. to indicate voiceless final -s- sound. O.E. sið is from PIE *se- "long, late" (cf. Ger. seit "since," Goth. seiþus "late," Skt. sayam "in the evening," L. serus "late").
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Practically the entire town showed up, and the event has been an annual
  tradition ever since.
Ever since she got it, the bench has rarely been idle.
We received this book as a gift last weekend and have been drooling over the
  pages ever since.
Artists have been trying to come to terms with photography's implications ever
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