mena

1. (of the moon) phase of the moon
   Moja baka sadi povrće prema mesečevim menama. — My grandma plants vegetables according to the phases of the moon.
   Mesečeve mene se smenjuju otprilike svakih sedam dana. — The moon's phases change roughly every seven days.
2. formal change; alteration
   Njegovo raspoloženje podložno je čestim menama. — His mood is subject to frequent changes.

Most often used in the plural in mesečeve mene.