Etymology of the French word demettre
the Old French word demettre
derived from the Classical Latin word dimittere (discontinue, renounce, abandon; dissolve; part with; put away; release, set free; allow to escape; send away, off; allow to go)
derived from the New Latin word di-
using the Latin prefix dis-
derived from the Medieval Latin word mittere (to send; send, throw, hurl)
using the Latin prefix di(s)-