menta- (1) vb. "send, cause to go" (in a desired direction) (VT41:6, VT43:15). A similar-sounding primitive verb mentioned in PE17:93 is said to have past and perfect forms that would produce Quenya *mennë, *eménië, but here Tolkien seems to be discussing a distinct intransitive verb “go” and its Sindarin descendants, and Quenya menta- rather belongs to the causative (transitive) verbs which according to the same source has “weak” past-tense forms (in -në, hence *mentanë “sent”, and likely *ementië as perfect “has sent”).
menta (2) noun "sending" or "message" as in sanwe-menta "thought-sending, mental message" (VT41:5)
