The term perfect has different meanings:
- For the mathematical concept, see perfect number.
- For the philosophical concept, see perfection.
- The grammatical idea is described in perfect tense.
- In botany and mycology, an organism is considered perfect if it is capable of sexual reproduction; otherwise it is imperfect. The terms have nothing to do with the quality of an organism.
- Fungi in the Division Deuteromycota (informally called the Fungi imperfecti) are so classified because sexual reproduction is unknown (or may not occur) in these species.
- A flower is called perfect (synoecious) if it has both male and female reproductive parts. A perfect or bisexual flower has both stamens and an ovary. If a flower has just male or just female parts it is termed imperfect.
- Hermaphrodite angiosperms are considered perfect relative to all other seed-bearing plants.
- In music: