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An initialism of "not applicable." Variously spelled "NA," "na," "N.A.," "n.a.," or "n/a." When I looked for the name of the safety inspector assigned to the sector, the company register simply said N/A. Just fill in the blanks of the form with "n.a." if the questions don't apply to you.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.