Perfect

Perfect could mean:

 Perfection (concept), a philosophical concept
 Perfection (law), a legal concept
 Perfect aspect, a grammatical concept

In mathematics:
 Perfect number
 Perfect group
 Perfect set
 Perfect graph

In biology:
 In botany and mycology, an organism is considered perfect if it is capable of sexual reproduction; otherwise it is imperfect.
 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" (or synoecious) if it has both male and female reproductive parts. A perfect or hermaphroditic flower has both stamens and an ovary. If a flower has just male or just female parts it is termed 'imperfect'.

In music:
 Perfect interval, one of these music intervals:
 Perfect octave
 Perfect fifth
 Perfect fourth
 Perfect unison

As a proper name:
 Perfect (film)
 Perfect Records, a record label
 Perfect Developer, a tool for developing computer 
 Perfect, Alanis Morissette song
 Perfect, Fairground Attraction song
 Perfect John Cale song
 "Perfect" (Sara Evans song)
 Perfect, Simple Plan song
 Perfect, Smashing Pumpkins song
 "Perfect" (True Faith song)
 "Perfect" (Flyleaf song)
 Perfect (Exceeder), a song by Mason vs. Princess Superstar
 Perfect (Princess Superstar song), the original, unremixed, version of the aforementioned song
 Perfect (band), a band from Poland
 Perfect (Sam Shaber album)