The story
Either a blend of Maine + mainly, or from Maine + -ly (“suffix to form an adjective”).
Etymology from Wiktionary, CC BY-SA 4.0.
Mainely
Today it means: Authentic to the U.S. state of Maine. Full definition →
Today it means: Authentic to the U.S. state of Maine. Full definition →
Either a blend of Maine + mainly, or from Maine + -ly (“suffix to form an adjective”).
Etymology from Wiktionary, CC BY-SA 4.0.