could
auxiliary verb
kəd,
ˈku̇d past tense of can
We found we could go.
in the past conditional,
We said we would go if we could.
and as an alternative to can suggesting less force or certainty or as a polite form in the present
If you could come, we would be pleased.
Love words? Need even more definitions?
Merriam-Webster unabridged



