A class plural suffix, identical to N. -ath (PE21/57). It is possible this suffix was also used as (and was perhaps inspired by) the Gnomish general plural suffix -th.
Quenya
quentasta
historical account
quentasta
noun. historical account
Element in
- Q. Noldo-quentasta Ingoldova “Ingoldo’s History of the Noldor” ✧ VT39/16
quentasta noun *"historical account", "any particular arrangement (by some author) of a series of records or evidences into a given historical account" (not History as such, which is quentalë). (VT39:16, VT48:19). May include the "group suffix" -asta.