Proposed derivations include: * Proto-Indo-European *ley- (“to flow”) (cognate with lītus). * Proto-Indo-European *lewH- (cognate with λύω (lúō)). * Proto-Indo-European *leh₁- (“to let, leave”) (cognate with Hittite [script needed] (laizzi, “lets”)) Compare also Latin dēleō and linō.
Ćwicz mówienie i zapamiętywanie " letum " i wielu innych słów i zdań z łaciński .