Available Definitions:
1) a. - Assured in mind; having no doubts; free from suspicions concerning.
2) a. - Determined; resolved; -- used with an infinitive.
3) a. - Not to be doubted or denied; established as a fact.
4) a. - Actually existing; sure to happen; inevitable.
5) a. - Unfailing; infallible.
6) a. - Fixed or stated; regular; determinate.
7) a. - Not specifically named; indeterminate; indefinite; one or some; -- sometimes used independenty as a noun, and meaning certain persons.
8) n. - Certainty.
9) n. - A certain number or quantity.
10) adv. - Certainly.