Archaic or dialectal form meaning firmness; the quality of being firm or stable.
Alternative form of firmitude, from Latin firmus with the -ity suffix (from Latin -itas). This form is largely obsolete, replaced by 'firmness' in modern English.
Old English had multiple ways to express the same idea—'firmity,' 'firmness,' and 'firmitude' all meant similar things, but natural language evolution favored the simpler 'firmness.'
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