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Primary

/ˈpraɪməri/

Something that is of most importance or comes first in rank or order.

Synonyms:

'All right, then,' King said, 'primary trigger switch.'He said, 'Sweets, how long till we hit the primary?'Primary trigger switch override engaged.

Derived from the Latin word primarius, meaning of the first rank, which itself is derived from primus, meaning first.

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