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English definition of “primary”

primary

adjective [not gradable]  /ˈprɑɪ·mer·i, -mə·ri/ us  

primary adjective [not gradable] (MOST IMPORTANT)

more important than anything else; main: The primary goal of the space flight was to recover a satellite.

primary adjective [not gradable] (IN EDUCATION)

relating to the first part of a child’s education: the primary grades

primary adjective [not gradable] (EARLIEST)

happening first: the primary stages of development

primary

noun [C]  /ˈprɑɪ·mer·i, -mə·ri/ us  

primary noun [C] (ELECTION)

politics & government an election in which people who belong to a political party choose who will represent that party in an election for political office
(Definition of primary from the Cambridge Academic Content Dictionary © Cambridge University Press)
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