1.
husband (humble)
A humble way to refer to one's own husband when speaking to others. This is the traditional term used when women speak about their own husbands.
2.
master, owner
The master or owner of a household, business, or establishment.
主人 is a humble term traditionally used by wives to refer to their own husbands. Some modern Japanese women prefer using 夫 instead, as 主人 literally means 'master' and can feel hierarchical. When referring to someone else's husband, use ご主人. The term can also mean the owner or proprietor of a business.