Mainely

Someone who exclusively or predominantly plays one character, stans one artist, or commits to one primary choice above all others — the embodiment of loyalty to a main. A mainer doesn't dabble; they have a single focus, deep knowledge, and usually strong opinions about anyone who plays their character badly or doesn't give their fave the credit they deserve. In gaming, a mainer is a specialist who's logged hundreds of hours on one pick. In fandom, it's the person who makes one artist their entire personality.

(US, transport) A lane of a road used by traffic.

(idiomatic, North America, collective) Everyday working-class people and small business owners, especially with regard to their concerns, social views, etc.

The proper name of the main street of any of many villages, towns, or small cities, especially in the United States, Canada, Ireland, and some parts of Scotland.

Normal, principal or standard.