Having a feeble or weak intellect.

Having light or fleet wings; swift.

Impervious to light; excluding the light perfectly.

Having a light or cheerful spirit.

(biology) A luminous organ of an animal.

Money levied for the maintenance of lighthouses; light dues.

A duty or toll levied on ships navigating certain waters, for the maintenance of lighthouses; light money.

(nautical) The waterline at which a vessel floats when at light displacement; the light waterline.

(nautical) The waterline at which a vessel floats when light or unladen.

(collectively) Light-armed cavalry.