τρίμηνον

From LSJ

ὃ σὺ μισεῖς ἑτέρῳ μὴ ποιήσεις → don't do to others what you don't want them to do to you

Source

English (Strong)

neuter of a compound of τρεῖς and μήν as noun; a three months' space: three months.

Russian (Dvoretsky)

τρίμηνον: (ῐ) τό трехмесячный промежуток, три месяца Polyb.