A noun for a “cleft”, most notably in Calacirya “Light-cleft” as mentioned in the Namárië poem (RGEO/62; LotR/377).
Conceptual Development: In Silmarillion drafts from the 1930s, this name was ᴹQ. Kalakilya (LR/173; MR/102), and the word ᴹQ. kilya “cleft, pass between hills, gorge” appeared in The Etymologies of the 1930s as a derivative of the root ᴹ√KIL “divide” (Ety/KIL). The word kilya also appeared with the gloss “chasm” in Lament of Atalante from the 1930s and 40s (LR/47, 56; SD/247, 310), but at some point when composing the final versions of the Namárië poem Tolkien switched to Calacirya, and he made the same change in later versions of Silmarillion drafts (MR/102).
Neo-Quenya: I’d avoid this word for Neo-Quenya, as it is too easily confused with cirya “ship”.
cirya _("k")_noun "ship" (MC:213, 214, 220, 221), "(sharp-prowed) ship" (SA:kir-, where the word is misspelt círya with a long í; Christopher Tolkien probably confused it with the first element of the Sindarin name Círdan. It seems that Círyon, the name of Isildur's son, is likewise misspelt; read Ciryon as in the index and the main text of the Silmarillion. Cf. also kirya_ in Etym, stem KIR.) _Also in Markirya. In the Plotz letter, cirya is inflected for all cases except plural possessive (*ciryaiva). The curious dual form ciriat occurs in Letters:427, whereas Plotz gives the expected form ciryat. Locative ciryasse "upon a ship" (MC:216). Compounded in ciryaquen "shipman, sailor" (WJ:372), also ciryando (PE17:58), cf. also ciryamo "mariner" (UT:8). Masc. names Ciryaher* "Ship-lord" (Appendix A), Ciryandil "Ship-friend" (Appendix A), Ciryatan "Ship-builder" (Appendix A), also Tar-Ciryatan**, name of a Númenórean king, "King Shipbuilder" (SA:kir-)