(mathematical analysis) A set which is equal to its set of limit points. That is, a set A is perfect if A'=A.

(epidemiology) The time elapsed between an exposure to a pathogenic organism, a chemical or radiation, and the appearance of signs and symptoms.

A type of brittle (confection) containing peanuts in a hard toffee.

A fine eraser, user to erase individual lines of written text

plural of perfect gold standard test

Having the quality of performing exceptionally well.

(management) Skills in dealing with or managing people.

plural of flying purple people eater

(US) A fanciful monster.

(biblical) The entrance way to Heaven. / (by extension) Heaven itself.