expressio unius est exclusio alterius

Main Entry: ex·pres·sio uni·us est ex·clu·sio al·ter·i·us
Pronunciation: ik-'spre-shE-O-yu-'nI-&s-"est-ik-'sklü-zE-O-ol-'tir-E-&s, ek-'spre-sE-O-ü-'nE-us-"est-ek-'sklü-sE-O-äl-te-'rE-us
Function: noun
Etymology: New Latin, the explicit mention of one (thing) is the exclusion of another
: a principle in statutory construction: when one or more things of a class are expressly mentioned others of the same class are excluded