asta (1) noun "month", a division of the year (VT42:20). Pl. astar is attested (Appendix D). According to VT48:11, the basic meaning of asta is "division, a part", especially one of other equal parts: "of the year, a month or period". According to VT48:19, asta is also used in Quenya as a group suffix (see quentasta).
Quenya
astar
faith, loyalty (not belief)
astar
noun. faith, loyalty
asta
month
asta
noun. month; division, part (esp. one of other equal parts)
astar noun "faith, loyalty (not belief)" (PE17:183). Not to be confused with the pl. form of asta #1.