Definition of "since" []

• From then until now or between then and now: They left town and haven't been here since. (adverb)
• Before now; ago: a name long since forgotten. (adverb)
• After some point in the past; at a subsequent time: My friend has since married and moved to California. (adverb)
• Continuously from: They have been friends since childhood. (preposition)
• Intermittently from: She's been skiing since childhood. (preposition)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Towards the end of the eighteenth century, Kant could say (without much exaggeration) that logic had followed a single path since its inception, and that ˜since Aristotle it has not had to retrace a single step™."
• "I think Halcyon is smarter than you think Alex since they hired Bale even before Dark Knight came out…they had no idea it was going to be so successful turning their lead actor into a superstar…they more than likely chose him because of his acting skills rather than on name recognition..since Bale hasn't been a big name in Hollywood even with Batman Begins"
• "Mr. Brayley, in his _Londiniana_, wrote about five years since that "if due care be taken when the old bridge is pulled down, the bones and ashes of its venerable architect may still be found;" -- and, true enough, _the bones of old Peter were found on removing the pier about a fortnight since_."