ad (“again”) + erthad (ger. of ertha- “unite”)
Sindarin
aderthad
noun. reuniting
aderthad
gerund noun. reuniting, reunion
aderthad
noun. reunion
adertha-
verb. to reunite
ertha-
verb. to unite
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.
aderthad
reunion
(ad- "re" + #erthad "union"), pl. aderthaid.
adertha
reunite
#adertha- (i adertha, in aderthar), verbal stem isolated from aderthad, see REUNION.
adertha
reunite
(i adertha, in aderthar), verbal stem isolated from aderthad, see
ertha
unite
#ertha- (i ertha, in erthar). Isolated from the gerund #erthad (itself isolated from aderthad "reunion").
ertha
unite
(i ertha, in erthar). Isolated from the gerund #erthad (itself isolated from aderthad "reunion").
A noun appearing in the name Mereth Aderthad “Feast of Reuniting” in The Silmarillion and its drafts (S/113; LR/126; SM/329), and also mentioned in The Etymologies of the 1930s (Ety/MBER).