1. a. : securely or solidly fixed in place. his teeth were firm. b. : not weak or uncertain : vigorous. a firm handshake. c. : having a solid or compact structure that resists stress or pressure. firm apples. 2. a (1) : not subject to change or revision. a firm offer. a firm date. (2) : not subject to price weakness : steady. firm commodities. b. More @Wikipedia
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