noun

1. (with "the") Something certain.

adjective

1. Sure, positive, not doubting.

   “I was certain of my decision.”

2. Determined; resolved.

3. Not to be doubted or denied; established as a fact.

Synonyms: unavoidable

pronoun

1. (with of) Unnamed or undescribed members (of).

   “There were serious objections to certain of the proposals.”

Synonyms: some