A verb in The Etymologies of the 1930s glossed “dance” derived from the root ᴹ√LILT of the same meaning (Ety/LILT). The verb reappeared as an active participle liltalyar “dancing” in notes from the late 1960s (PE23/134).
Conceptual Development: The Qenya Lexicon of the 1910s had ᴱQ. lilt- “to dance” under the early root ᴱ√LḶTḶ (QL/55), where [[eq|short syllabic [ḷ] became [il]]] (PE12/11). It reappeared in the Early Qenya Grammar and English-Qenya Dictionary of the 1920s, where its past forms lalsie or †laltye indicate the development of [[eq|long syllabic [ḹ] to [al]]] (PE14/58; PE15/71). After Tolkien decided that syllabic ḷ, ṇ, ṛ were not vowels in Primitive Elvish, he revised the root to ᴹ√LILT as noted above, so that the verb would probably have a more regular past like ✱liltane.
lilta- vb. "dance" (LILT, Narqelion)