Definition of cap
1 a
:a head covering especially with a visor and no brim
b
:a distinctive head covering emblematic of a position or office: such as
(1)
:a cardinal's biretta
(2)
:mortarboard
2
:a natural cover or top: such as
a
:an overlying rock layer that is usually hard to penetrate
c
:the top of a bird's head or a patch of distinctively colored feathers in this area
3 a
:something that serves as a cover or protection especially for a tip, knob, or end
- a bottle cap
b
:a fitting for closing the end of a tube
d
:an artificial crown for a tooth
4
:an overlaying or covering structure
5
:a paper or metal container holding an explosive charge (as for a toy pistol)
6
:an upper limit (as on expenditures) :ceiling
- a cap on military spending
7
:the symbol ∩ indicating the intersection of two sets — compare cup 9
8
:a cluster of molecules or chemical groups bound to one end or a region of a cell, virus, or molecule
—
cap in hand
:in a respectful, humble, or sometimes fearful manner
- went cap in hand to the governor to seek more funds for education
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