ita 3) pron "that which" (VT49:12), emended from tai (#1, q.v.) The form ita is compounded from the relative pronoun i + the pronoun ta "that, it".
Quenya
alasaila ná lá carë tai mo nave mára
it is unwise not to do what one judges good
tai
that which, what
ita
that which
tai (1) pron. "that which, what", "which fact" (VT42:34, VT49:12, 20). The word occurs in the sentence alasaila ná lá carë tai mo navë mára, translated "it is unwise not to do what one judges good". So tai = "what", but it means more literally "that which" (VT49:12), ta + i (cf. ta #1 and the use of i as a relative pronoun). In one note, Tolkien emended tai to ita, reversing the elements (VT49:12) and also eliminating the ambiguity involving the homophone tai #2, see below.