正妻

正妻	zhèng qī	primary wife (in contrast to concubine); legal wife
正	zhēng	first month of the lunar year
正	zhèng	straight / upright / proper / main / principal / to correct / to rectify / exactly / just (at that time) / right (in that place) / (math.) positive
妻	qī	(bound form) wife
妻	qì	to marry off (a daughter)