The Collaborative International Dictionary of English v.0.48:

Since \Since\, prep.
   From the time of; in or during the time subsequent to;
   subsequently to; after; -- usually with a past event or time
   for the object.
   [1913 Webster]

         The Lord hath blessed thee, since my coming. --Gen.
                                                  xxx. 30.
   [1913 Webster]

         I have a model by which he build a nobler poem than any
         extant since the ancients.               --Dryden.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Since \Since\, conj.
   Seeing that; because; considering; -- formerly followed by
   that.
   [1913 Webster]

         Since that my penitence comes after all,
         Imploring pardon.                        --Shak.
   [1913 Webster]

         Since truth and constancy are vain,
         Since neither love, nor sense of pain,
         Nor force of reason, can persuade,
         Then let example be obeyed.              --Granville.
   [1913 Webster]

   Syn: Because; for; as; inasmuch as; considering. See
        Because.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Since \Since\ (s[i^]ns), adv. [For sins, contr. fr. OE. sithens,
   sithenes, formed by an adverbial ending (cf. Besides) from
   OE. sithen, also shortened into sithe, sin, AS.
   si[eth][eth]an, sy[eth][eth]an, seo[eth][eth]an, afterward,
   then, since, after; properly, after that; fr. s[imac][eth]
   after, later, adv. and prep. (originally a comparative adv.,
   akin to OS. s[imac][eth] afterward, since, OHG. s[imac]d, G.
   seit since, Goth. sei[thorn]us late, ni [thorn]anasei[thorn]s
   no longer) + [eth]on instrumental of the demonstrative and
   article. See That.]
   1. From a definite past time until now; as, he went a month
      ago, and I have not seen him since.
      [1913 Webster]

            We since become the slaves to one man's lust. --B.
                                                  Jonson.
      [1913 Webster]

   2. In the time past, counting backward from the present;
      before this or now; ago.
      [1913 Webster]

            How many ages since has Virgil writ?  --Roscommon.
      [1913 Webster]

            About two years since, it so fell out, that he was
            brought to a great lady's house.      --Sir P.
                                                  Sidney.
      [1913 Webster]

   3. When or that. [Obs.]
      [1913 Webster]

            Do you remember since we lay all night in the
            windmill in St. George's field?       --Shak.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "since":
   aeons ago, after, after all, after that, afterwards, ages ago, ago,
   as, as long as, as things go, back, back when, backward, because,
   behind, being, being as how, below, cause, considering, ever since,
   ex post facto, following, for, forasmuch as, from away back,
   from time immemorial, gone by, in that, in the aftermath,
   in the sequel, inasmuch as, insofar as, insomuch as, into the past,
   later, long since, next, parce que, reminiscently, retroactively,
   retrospectively, seeing, seeing as how, seeing that,
   since long ago, since time began, subsequent to, subsequently,
   then, thereafter, thereon, thereupon, therewith, until now,
   whereas