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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

object, physical object go
a tangible and visible entity

location go
a point or extent in space

line go
a spatial location defined by a real or imaginary unidimensional extent

axis
a straight line through a body or figure that satisfies certain conditions

noun.cognition

7 Subcategories

coordinate axis go
one of the fixed reference lines of a coordinate system
major axis go
the longest axis of an ellipse or ellipsoid
semimajor axis go
one-half the major axis of an ellipse
minor axis go
the shorter or shortest axis of an ellipse or ellipsoid
semiminor axis go
one-half the minor axis of an ellipse
principal axis, optic axis go
a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted
optic axis go
in a doubly refracting crystal, the line in the direction of which no double refraction occurs