The definition of leave is to depart, or to let something alone, or to bequeath.(verb)
Leave is defined as permission, or is time off from work.(noun)
See leave in Webster's New World College Dictionary
Origin: ME leven < OE læfan, lit., to let remain (< *lafjan < base of laf, remnant, what remains), akin to (be)lifan, to remain, Ger bleiben, OHG belīban < IE *leip-, to smear with grease, stick to < base *lei-, viscous, sticky > L limus: see lime
Origin: ME leve < OE leaf, permission, akin to obs. Ger laube, permission, erlauben, to allow, permit < IE base *leubh-, to like, desire > lief, love, L libido
See leave in American Heritage Dictionary 4
verb left left (lĕft), leav·ing, leaves leaves verb, transitive
Origin: Middle English leaven
Origin: , from Old English lǣfan; see leip- in Indo-European roots.
Origin: Middle English leve
Origin: , from Old English lēafe
Origin: , dative and accusative of lēaf; see leubh- in Indo-European roots.
Learn more about leave