| firm | (noun) the members of a business organization that owns or operates one or more establishments | Synonyms: business firm, house |
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| firmament | (noun) the apparent surface of the imaginary sphere on which celestial bodies appear to be projected | Synonyms: celestial sphere, empyrean, heavens, sphere, vault of heaven, welkin |
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| firmness | (noun) the quality of being steady or securely and immovably fixed in place | Synonyms: steadiness |
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| (noun) the trait of being resolute | Synonyms: firmness of purpose, resoluteness, resolution, resolve |
| (noun) the property of being unyielding to the touch | - |
| (noun) the muscle tone of healthy tissue | Synonyms: soundness |
| firmware | (noun) (computer science) coded instructions that are stored permanently in read-only memory | Synonyms: microcode |
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