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fit

/fɪt/

Suitable, properly sized, or physically healthy

From English; uncertain Germanic origin fit (Suitability).

noun
verb
adjective
fit
Old English (possible)
Verified
fitt
“song”; a proposed source for one later sense of fit, though the connection is uncertain

from Middle English fit (“an adversary of equal power”), of uncertain further origin. The original sense appears to...

Middle English (possible)
Verified
fit
“an adversary of equal power”; another proposed source, perhaps linked to matching or suitability

from Middle English fit (“an adversary of equal power”), of uncertain further origin. The original sense appears to...

Modern English
Verified
fit
“suitable,” “properly sized,” or “in good physical condition”

from Middle English fit (“an adversary of equal power”), of uncertain further origin. The original sense appears to...

Modern English
fit

Short words can hide surprisingly messy histories, and fit is one of them. One theory begins with Middle English fit, “an adversary of equal power”—someone who was your match—then imagines the word sliding from matching opponents to fitting things together. Another possibility points to Old English fitt, “song,” perhaps connected not to combat at all but to something fitted or measured in length; the dictionaries politely admit that the trail goes cold. English later built an entire family around the idea: a misfit does not belong, while fitness describes a body that is well adapted to its demands. The word’s respectable relatives also brush against stranger territory: doughty, meaning brave or capable, descends from a Proto-Germanic family associated with being fit and useful, whereas match took a completely different route—from a lamp wick, ultimately linked to mucus. So when someone says “That’s a perfect fit,” the phrase may be carrying two ancient pictures at once: opponents evenly matched and pieces snugly meeting.

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