in geometry, the secant of an arch which is the complement of another to 90°. See Geometry.

**COSGENAGE**, in law, a writ that lies where the trefail, that is, the tritavus, the father of the befail, or great grandfather, being seized in fee at his death of certain lands or tenements, dies; a stranger enters, and abates; then shall his heir have this writ of cosnage; the form of which see in Fitzh. Nat. Br. fol. 221.