The Collaborative International Dictionary of English v.0.48:

Throughout \Through*out"\, prep.
   Quite through; from one extremity to the other of; also,
   every part of; as, to search throughout the house.
   [1913 Webster]

         Nor to their idle orbs doth sight appear
         Of sun, or moon, or star, throughout the year.
                                                  --Milton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Throughout \Through*out"\, adv.
   In every part; as, the cloth was of a piece throughout.
   [1913 Webster]

WordNet (r) 3.0 (2006):

throughout
    adv 1: from first to last; "the play was excellent end-to-end"
           [syn: throughout, end-to-end]
    2: used to refer to cited works [syn: passim, throughout]

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "throughout":
   ad infinitum, all over, all through, amid, around, at about,
   at all points, at full length, at large, completely, diffusely,
   dispersedly, durante, during, entirely, every bit, every inch,
   every whit, everywhere, far and near, far and wide, fully,
   head and shoulders, heart and soul, here and there, high and low,
   in all quarters, in all respects, in every respect, in extenso,
   in places, in spots, inside and out, mid, midst, neck deep,
   on all counts, over, overall, passim, pending, root and branch,
   round, round about, sparsely, sparsim, sporadically, through,
   through and through, to the brim, to the death, to the end,
   to the hilt, wherever you look, wholly, you name it