Crossword Genius

When elected, the was in the majority (5)

Ross

I believe the answer is:

major

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'majority' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

I can't explain the remainder of the clue.

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(Other definitions for major that I've seen before include "Of considerable importance" , "Army officer immediately junior to a lieutenant colonel" , "Significant, main" , "grave" , "Army rank" .)

I've seen this clue in the Evening Standard.
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