A term for Men as the second-born children of Ilúvatar, after the Elves, also attested in its plural form Eboennin (WJ/387). It seems to be a compound of ab “after” and onnen “born”.
Sindarin
eb
preposition. ?before
eblaer
noun. June, ?Before-summer
eb
preposition. save, except
dannen
noun. ebb, lowtide
dannen
noun. ebb, low tide
aebin
noun. cherry (tree)
dannen
ebb
abonnen
proper name. After-born
abonnen
afterborn
pl. Ebennin (archaic "Eboennin" = Ebönnin, WJ:387), Elvish name of Men as the "Secondborn" of Eru. – If ab can be used as an independent preposition, it is probably followed by soft mutation.****
ab
preposition. after
ab-
prefix. after, later
ephola-
verb. ?to remember
ab
after
#ab (only attested as a prefix, as in:)
ab
after
(only attested as a prefix, as in:)
nórui
june
dannen (i nannen, o ndannen) (low tide), pl. dennin (i ndennin). (VT48:26) Notice the homophone dannen ”fallen” (but this past participle has different mutations). (VT48:26)