An (archaic) word for “ocean”, an augmentative form of airë mentioned in a couple of later notes (PE17/27, 149). A more modern form is ëaron.
Conceptual Development: The form ᴹQ. airen appeared in parenthesis beside ᴹQ. aire “sea” in The Etymologies of the 1930s (Ety/AY). Helge Fauskanger suggested that it might be a genitive form (QQ/airë), but in notes on The Feanorian Alphabet from the 1930s, aire “sea” >> airen (PE22/23 note #70), suggesting it is an alternate (augmentative?) form. If so, it is probably a precursor to airon.
ëar noun "sea" (AYAR/AIR [gives also dat. sg. ëaren],WJ:413; see Letters:386 for etymology). Not to be confused with the pl. form of the verb ëa "be, exist". Pl. ëari "seas" (FS, LR:47); Eär "the Great Sea" (cf. ëaron "ocean"), ablative Eärello "from the Great Sea", et Eärello "out of the Great Sea" (EO). Eärë noun "the open sea" (SD:305). Compound ëaruilë noun "seaweed" (UY). Found in proper names like Eärendil "Sea-friend", Eärendur masc. name, *"Sea-servant"; in effect a variant of Eärendil(Appendix A). Eärendur was also used ="(professional) mariner" (Letters:386).Fem. name Eärwen "Sea-maiden" (Silm); Eärrámë "Sea-wing", "Wings of the Sea", name of Tuor's ship (RAM, AYAR/AIR, SA)