Definition of "cone"

(geometry) A surface of revolution formed by rotating a segment of a line around another line that intersects the first line.  examples

(geometry) A solid of revolution formed by rotating a triangle around one of its altitudes.  examples

(topology) A space formed by taking the direct product of a given space with a closed interval and identifying all of one end to a point.

Anything shaped like a cone.  examples

The fruit of a conifer.  examples

A cone-shaped flower head of various plants, such as banksias and proteas.  examples

An ice cream cone.  examples

A traffic cone  examples

A unit of volume, applied solely to marijuana and only while it is in a smokable state; roughly 1.5 cubic centimetres, depending on use.  examples

(anatomy) Any of the small cone-shaped structures in the retina.  examples

(slang) The bowl piece on a bong.

(slang) The process of smoking cannabis in a bong.

(slang) A cone-shaped cannabis joint.

(slang) A passenger on a cruise ship (so-called by employees after traffic cones, from the need to navigate around them)

(category theory) An object V together with an arrow going from V to each object of a diagram such that for any arrow A in the diagram, the pair of arrows from V which subtend A also commute with it. (Then V can be said to be the cone’s vertex and the diagram which the cone subtends can be said to be its base.)  examples

A shell of the genus Conus, having a conical form.  examples

(computing theory) A set of formal languages with certain desirable closure properties, in particular those of the regular languages, the context-free languages and the recursively enumerable languages.  examples

(transitive) To fashion into the shape of a cone.  examples

(intransitive) To form a cone shape.  quotations  examples

(frequently followed by "off") To segregate or delineate an area using traffic cones.  quotations  examples