A root appearing in notes from the late 1950s to early 1960s (PE17/74) where Tolkien was attempting to explain the origin of the adverbial suffix Q. -lë. He said:

But adverbial forms were available especially for when far separated from verb or subject. The chief was -le. This is probably from √LEŊ, cf. fortified form in Q lenge, gesture, characteristic look, gesture or trait etc., weak verb lenga, behave.

lé as noun also is used in sense of “way”, sc. method, manner, as in “that is not A’s way”. Thus oia, everlasting, oiale, everlastingly. Cf. talle, like that, sille, like this, so, yalle, as (in the same way as).

Tolkien then crossed through the first of these paragraphs, saying: “This won’t do, since le is a pronominal element. It should be ve, oiave”. However, he eventually let the word Q. oialë “forever” stand in the Namarië poem, so perhaps he changed his mind again. Despite their rejection, √LEÑ and its derivatives are extremely useful, and I would treat them as valid for purposes of Neo-Eldarin.