What is But?

But definition and meaning on Dictionary terms:
on the contrary; yet: My brother went, but I did not.
except; save: She was so overcome with grief she could do nothing but weep.
unless; if not; except that (followed by a clause, often with that expressed): Nothing would do but that I should come in.
without the circumstance that: It never rains but it pours.

otherwise than: There is no hope but by prayer.
that (used especially after doubt, deny, etc., with a negative): I don’t doubt but he will do it.
who not; that not: No leaders worthy of the name ever existed but they were optimists.
(used as an intensifier to introduce an exclamatory expression): But she’s beautiful!
Informal. than: It no sooner started raining but it stopped.

with the exception of; except; save: No one replied but me.

only; just: There is but one God.


reference: www.dictionary.com/browse/but