what are the meanings of the months?

By meanings, if you mean you want the words in both Spanish and English, here you are:

Sunday domingo
Monday lunes
Tuesday martes
Wednesday miércoles
Thursday jueves
Friday viernes
Saturday sábado

1. All the days of the week are masculine in Spanish:
singular = el lunes
plural = los lunes

2. The way to say "on" any day of the week,is with the definite article
el lunes = on Monday / los lunes = on Mondays

3. The days of the week are capitalized in English, but NOT in Spanish.

Sra