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"main" is also used as a crossword clue. If that's what you saw, the answer is often predominant (11 letters).
Definitions
Chief or most important
Word origin
From Middle English mayn, main, maine, mæin, meyn, from main (noun) (see further at etymology 2); compare Old English mæġen (“strong, main, principal”) (used in combination) and Old Norse megn, megenn (“strong, main”).
Used in a sentence
“The main office is actually one of the smaller rooms.”
“main timbers”
“main branch of a river”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer5 curated clues
01“Chief”4 letters
02“Primary”4 letters
03“Primary or chief”4 letters
04“Principal”4 letters
05“Principal street, often”4 letters
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