Definitions for: Could

[v] expresses possibility; "I could do it by myself"

Webster (1913) Definition: Could (k??d), imp. of Can. [OF. coude. The l was
inserted by mistake, under the influence of should and
would.]
Was, should be, or would be, able, capable, or susceptible.
Used as an auxiliary, in the past tense or in the conditional
present.

Synonyms: might