scilicet

scilicet is a whole clause frozen into an adverb: scire licet, "one may know". Its twin videlicet (videre licet, "one may see") behaves the same way and survives in the English legal abbreviation "viz.".

Two uses, pulling in opposite directions. As a marker of explanation it means "that is to say, namely", introducing the specific instance of a general term, and this is the sense that dominates in technical and legal writing. As a tone word it means "of course, naturally" and is very often dry: Cicero uses it to say the opposite of what it states, in the register of "obviously". Which one is meant depends on whether it is introducing a fresh item or commenting on one already there.