ista-

verb. know

ista- (2) vb. "know", pa.t. sintë (IS, LT2:339, VT48:25). This past tense Tolkien called "certainly irregular" (VT48:25, where an alternative pa.t. isintë is also mentioned, but sintë is said to be the older form; compare editorial notes in VT48:32. Ista- is also used for "can" in the sense of "know how to", as in istan quetë "I can speak (because I have learned (a) language)" (VT41:6) Passive participle sinwa "known, certain, ascertained" (VT49:68)

ista-

verb. to know, to know, [ᴹQ.] learn

ista

knowledge

ista (1) noun "knowledge" (IS). Also istya.

ista

verb. know

istya

knowledge

istya noun "knowledge" (IS). Also ista (#1).

istare

noun. knowledge

Nolmë

knowledge, philosophy (including science)

Nolmë ("ñ")noun "knowledge, Philosophy (including Science)" (PM:360 cf. 344)

handë

knowledge, understanding, intelligence

handë noun "knowledge, understanding, intelligence" (KHAN). Note: *handë is (probably) also the past tense of the verb har- "sit".

issë

knowledge, lore

issë noun "knowledge, lore" (LT2:339; rather ista or istya in Tolkien's later Quenya)