Quenya 

yáviérë

noun. *autumn-day

Elements

WordGloss
yávië“autumn, harvest [time or act]”
“day (period from sunset to sunset)”

yávië

autumn

yávië noun "autumn" (SA:yávë); "autumn, harvest", in the calendar of Imladris a precisely defined period of 54 days, but also used without any exact definition (Appendix D). Noun yáviérë *"Autumn-day", a day outside the months in the Steward's Reckoning, inserted between Yavannië and Narquelië (September and October) (Appendix D)

Endien

autumn

Endien noun, alternative term for "autumn" (PM:135). In the Etymologies, the word Endien was assigned a quite different meaning: "Midyear, Midyear week", in the calendar of Valinor a week outside the months, between the sixth and seventh months, dedicated to the Trees; also called Aldalemnar (YEN, LEP/LEPEN/LEPEK)