a kind of soft, flat hat without a brim, and sometimes having a visor.
He wore a flat cap , old woolen trousers, and a brown shirt that was several sizes too large for him.
a protective lid or cover for an object such as a bottle, the point of a pen, or a camera lens.
She pointedly puts the cap on her camera lens and walks with him.
an upper limit imposed on spending or other activities.
a cap on government purchases
short for capitalization.