adj. (of a motion) in the direction of contraction of a muscle. (E.g. extension of the lower arm via the elbow joint while contracting the triceps and other elbow extensor muscles; closing of the jaw while flexing the masseter).
the GNU version of the Collaborative International Dictionary of English
adj. Having a common center, as circles of different size, one within another.
n. That which has a common center with something else.
The Century Dictionary and Cyclopedia
Having a common center: as, concentric circles, spheres, etc.
n. One of a number of circles or spheres having a common center.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. having a common center
Word Usage
"When it comes to location, the value of properties generally conforms to what I call the concentric circle theory."