What does main mean?
Main means the chief, principal, or most important member of a group or the most significant aspect of a situation. It is used regularly for a primary reason, concern, objective, subject, or feature, as in "the main reason" and "the main course." Although main is similar in meaning to principal and chief, it often has a slightly broader, less formal character and is especially common in everyday discussion and explanatory writing. As a noun, main can refer to the principal person or thing, though this use is less frequent. In literary and nautical contexts, "the main" can also mean the open sea. The adverbial use "in the main" means "for the most part." The word is useful because it identifies what is centrally important and distinguishes it from secondary details, alternatives, or minor considerations.
Chief, principal, or of greatest importance.
"We agreed on the main objectives but left the details open for discussion."
Main is especially common before words such as reason, concern, objective, feature, and course.
The chief or most important person, thing, or subject; in literary or nautical usage, the open sea.
"The success of the campaign was the main achievement of the year."
The sense meaning the open sea is literary and nautical, as in "the main."
For the most part or in the main.
"The early delays were minor; in the main, the project proceeded according to plan."
Usually used for principal people, things, or courses of action; the plural is uncommon.
"The mains reflected the principal concerns raised during the consultation."
Main once meant power or strength, so calling something the main is another way of saying it has the greatest force.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does main come from?
Main comes from Old English mǣgen, meaning "strength, power, or force," and developed through Middle English to its modern sense of "chief" or "principal." The word has Germanic relatives, including English might in the sense of power, while the archaic adverb amain retains the same root. The sense of greatest importance arose through the idea of greater or principal power, and forms such as mainsail and mainland developed from the same historical base.
Related word forms
How main is actually used
Main is widely used in formal and informal English. It is especially common when identifying the most important point, reason, concern, or feature of something. The noun is less common and is often literary, especially in the expression "the main" for the open sea.
Easily confused with main
A mane is the long hair growing on the neck of a horse or other animal; a main is the chief or most important one.
Main means chief or most important, whereas mean can mean average, unkind, or intended, depending on context.