mainly

The word “mainly” means for the most part; chiefly. In plain terms, mostly, or to the greatest extent — used to say what applies in most cases.

“Mainly” is pronounced MAYN-lee (/ˈmeɪnli/ in IPA).

Here is “mainly” used in a sentence: “The audience was mainly teenagers.”

Words with a similar meaning to “mainly” include principally.

“Mainly” is an adverb.

The word “mainly” comes from Middle English. From Middle English maynly, from main + -ly.

“Mainly” is a fairly common word in modern English, usually learned at around the A2 level.

The two are very close and often interchangeable. 'Mainly' stresses the chief or most important part — the group is mainly students. 'Mostly' stresses the greater proportion or the usual case — the group is mostly quiet. 'Mainly' points to what dominates; 'mostly' points to what is true most of the time.

Good alternatives include 'mostly,' 'chiefly,' 'primarily,' 'largely,' 'principally,' and 'predominantly.' Each conveys that something is true for the most part or that one element dominates. 'Chiefly' and 'principally' feel slightly more formal, while 'mostly' and 'largely' are more everyday. Choose the one that best fits your tone.

'Mainly' is neutral and works in both formal and informal contexts. You can use it comfortably in conversation, business writing, and academic work alike. If you want a slightly more formal tone, 'chiefly,' 'primarily,' or 'principally' are close alternatives; for a casual tone, 'mostly' fits well.