- having a common axis or coincident axes.
- Geometry.
- (of a set of circles) having the property that each pair of circles has the same radical axis.
- (of planes) intersecting in a straight line.
- (of a loudspeaker) having two or more cones with their centers mounted on the same axis.
- having or being mounted on a common axis
- (of a set of circles) having all the centres on a straight line
- formed from, using, or connected to a coaxial cable
