Sindarin 

mereth aderthad

proper name. Feast of Reuniting

A feast held by Fingolfin for the Elves of Beleriand, translated as “Feast of Reuniting” (S/113), a combination of mereth “feast” and aderthad “reuniting” (SA/mereth).

Conceptual Development: This name first appeared as N. Mereth Aderthad “Feasts and Games of Reuniting” in Silmarillion drafts from the 1930s (SM/329). In The Etymologies, the noun N. mereth was rejected and replaced by bereth (Ety/MBER), but as pointed out by Christopher Tolkien, the noun was never changed in the narratives, so Tolkien likely reverted this change.

Elements

WordGloss
mereth“feast, feast, [N.] festival”
aderthad“reuniting”
Sindarin [LT1I/Mereth Aderthad; S/113; SA/mereth; SI/Mereth Aderthad; WJI/Mereth Aderthad] Group: Eldamo. Published by