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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).
adverb
3.
for all that; however.
Idioms
4.
as though, as if:
It seems as though the place is deserted.