tennaprep. "until, up to, as far as" (CO), "unto" (VT44:35-36), "to the point", "right up to a point" (of time/place), "until", "to the object, up to, to (reach), as far as" (VT49:22, 23, 24, PE17:187), elided tenn' in the phrase tenn' Ambar-metta "unto the ending of the world" in EO, because the next word begins in a similar vowel; cf. tennoio "for ever" (tenna + oio, q.v.) The unelided form appears in PE17:105: Tenna Ambar-metta.
mennai
until
mennaiprep. "until" (VT14:5; in Tolkien's later Quenya rather tenna)
tenna prep. "until, up to, as far as" (CO), "unto" (VT44:35-36), "to the point", "right up to a point" (of time/place), "until", "to the object, up to, to (reach), as far as" (VT49:22, 23, 24, PE17:187), elided tenn' in the phrase tenn' Ambar-metta "unto the ending of the world" in EO, because the next word begins in a similar vowel; cf. tennoio "for ever" (tenna + oio, q.v.) The unelided form appears in PE17:105: Tenna Ambar-metta.