firm¹ / fərm/ • adj. 1. having a solid, almost unyielding surface or structure: the bed should be reasonably firm, but not too hard. ∎  solidly in place and stable: no building can stand without firm foundations fig. he was unable to establish the store on a firm financial footing. ∎  having steady but not excessive power or strength: you need a firm grip on the steering. ∎  (of a person, action, or attitude) showing resolute determination and strength of character: he didn't like being firm with Larry, but he had to.2. strongly felt and unlikely to change: he retains a firm belief in the efficacy of prayer. ∎  (of a person) steadfast and constant: we became firm friends. ∎  decided upon and fixed or definite: she had no firm plans for the next day. ∎  (of a currency, a commodity, or shares) having a steady value or price that is more likely to rise than fall: the dollar was firm against the yen.• v. [tr.] make (something) physically solid or resilient: an exercise program designed to firm up muscle tone. ∎  fix (a plant) securely in the soil. ∎  [intr.] (of a price) rise slightly to reach a level considered secure: he believed house prices would firm by the end of the year. ∎  make (an agreement or plan) explicit and definite: archaeologists have now firmed up this new view.• adv. in a resolute and determined manner: she will stand firm against the government's proposal.PHRASES: be on firm ground be sure of one's facts or secure in one's position, esp. in a discussion.a firm hand strict discipline or control.DERIVATIVES: firm·ly adv.firm·ness n.firm² • n. a business concern, esp. one involving a partnership of two or more people: a law firm.