(astronomy, celestial mechanics) The angle PFC formed by P = the periapsis of a celestial body's elliptical orbit, F = the focus of that orbit, and C = the current position of the celestial body.

plural of true blue

according to one's beliefs.

plural of true crime

Curculionidae genera and species.

(uncountable) A nonfiction literary and film genre in which the author examines an actual crime and details the actions of real people. / (countable) A particular work of this genre.

(navigation) Direction relative to true north, typically as contrasted with magnetic bearing.

An adjustment to make something equal or correct.

plural of true-up

(ichthyology) Any sole of the family Soleidae.