Having all the required or desirable elements, qualities, or characteristics; as good as it is possible to be. The weather was perfect for a day at the beach.
Completely free from faults or defects; flawless. Her performance was perfect, earning her a standing ovation.
Absolute; complete or total (used for emphasis). He was in perfect agreement with the proposal.
(Grammar) Relating to a verb tense or aspect that expresses a completed action. In the sentence "I have eaten", the verb is in the perfect aspect.