Than

conjunction
1.
(used, as after comparative adjectives and adverbs, to introduce the second member of an unequal comparison):
She’s taller than I am.
2.
(used after some adverbs and adjectives expressing choice or diversity, such as other, otherwise, else, anywhere, or different, to introduce an alternative or denote a difference in kind, place, style, identity, etc.):
I had no choice other than that. You won’t find such freedom anywhere else than in this country.
3.
(used to introduce the rejected choice in expressions of preference):
I’d rather walk than drive there.
4.
except; other than:
We had no choice than to return home.
5.
when:
We had barely arrived than we had to leave again.
preposition
6.
in relation to; by comparison with (usually followed by a pronoun in the objective case):
He is a person than whom I can imagine no one more courteous.
conjunction, preposition (coordinating)
1.
used to introduce the second element of a comparison, the first element of which expresses difference: shorter than you, couldn’t do otherwise than love him, he swims faster than I run
2.
used after adverbs such as rather or sooner to introduce a rejected alternative in an expression of preference: rather than be imprisoned, I shall die
3.
other than, besides; in addition to