lúmequentalë ("q")noun "history" (LU, KWET). According to VT45:29, the accent marking the ú as a long vowel is actually missing in the entry LU in Tolkien's original Etymologies manuscript; yet it is apparently included both in the entry KWET and in the related words lúmequenta and lúmequentalëa; its omission in the entry LU is therefore probably just a slip.
Quenya
lúmequenta
history, chronological account
lúmequentalë
history
lúmë
time
lúmë (1) noun "time" (LU, PE17:168) or "hour", locative lúmessë (VT43:34), pl. locative lúmissen "at the times" (VT49:47), allative lúmenna "upon the hour", elided lúmenn' in the greeting elen síla lúmenn' omentielvo "a star shines upon the hour of our meeting", because the next word begins with a similar vowel. The complete form lúmenna omentielvo is found in WJ:367 and Letters:425 (footnote). Cf. also the compounds lumenyárë and lúmequenta, q.v.; see also #sillumë.
lumenyárë
history, chronological account
lumenyárë noun "history, chronological account" (NAR2 - read *lúmenyárë?) According to VT45:36, the manuscript spelling actually seems to be lumennyáre, but Hostetter and Wynne conclude that this is "probably a slip": The double nn would be difficult to justify.
lú
time, occasion
lú noun "a time, occasion" (LU)
lúmequenta ("q")noun "history, chronological account" (LU)