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

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

n (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.

n Anything shaped like a cone.The Illustrated Oxford Dictionary, Oxford University Press, 1998

n The fruit of a conifer.

n An ice cream cone.

n 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.

n Any of the small cone-shaped structures in the retina.

n (slang) The bowl piece on a bong.

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

n (slang) A cone-shaped cannabis joint.

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

n (category theory) Given a diagram F : J → C, a cone consists of an object N of C, together with a family of morphisms ψ_X : N → F(X) indexed by all of the objects of J, such that for every morphism f : X → Y in J, $F(f)\; \backslash circ\; \backslash psi\_X\; =\; \backslash psi\_Y$. Then N is the vertex of the cone, whose sides are all the ψ_X indexed by Ob(J) and whose base is F. The cone is said to be "from N to F" and can be denoted as (N, ψ).

v (context|pottery) To fashion into the shape of a |cone.