GENERAL INFO

Ma is a feminine singular possessive adjective meaning "my."

USAGE

It is used directly before a feminine singular noun to indicate possession. For example: "ma voiture" (my car), "ma maison" (my house).

TRAPS

Even for feminine singular nouns, you use "mon" (the masculine form) if the noun starts with a vowel or a silent 'h'. This is for pronunciation (to avoid hiatus). For example: "mon amie" (my friend, feminine), "mon école" (my school).