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though

[th oh]
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conjunction
  1. (used in introducing a subordinate clause, which is often marked by ellipsis) notwithstanding that; in spite of the fact that; although: Though he tried very hard, he failed the course.
  2. even if; granting that (often preceded by even).
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adverb
  1. for all that; however.
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Idioms
  1. as though, as if: It seems as though the place is deserted.
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Origin of though

1150–1200; Middle English thoh < Old Norse thō (earlier *thauh); replacing Old English thēah; cognate with German doch, Gothic thauh

Usage note

Among some conservatives there is a traditional objection to the use of though in place of although as a conjunction. However, the latter (earlier all though ) was originally an emphatic form of the former, and there is nothing in contemporary English usage to justify such a distinction.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for even though

though

conjunction (subordinating)
  1. (sometimes preceded by even) despite the fact thatthough he tries hard, he always fails; poor though she is, her life is happy
  2. as though as ifhe looked as though he'd seen a ghost
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adverb
  1. nevertheless; howeverhe can't dance: he sings well, though
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Word Origin

Old English theah; related to Old Frisian thāch, Old Saxon, Old High German thōh, Old Norse thō
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 even though

though

c.1200, from Old English þeah, and in part from Old Norse þo "though," both from Proto-Germanic *thaukh (cf. Gothic þauh, Old Frisian thach, Middle Dutch, Dutch doch, Old High German doh, German doch), from PIE demonstrative pronoun *to- (see that). The evolution of the terminal sound did not follow laugh, tough, etc., though a tendency to end the word in "f" existed c.1300-1750 and persists in dialects.

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Online Etymology Dictionary, © 2010 Douglas Harper

Idioms and Phrases with even though

though

see as if (though).

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