from
The Collaborative International Dictionary of English v.0.48
Commensurable \Com*men"su*ra*ble\, a. [L. commensurabilis; pref.
com- + mensurable. See {Commensurate}, and cf.
{Commeasurable}.]
Having a common measure; capable of being exactly measured by
the same number, quantity, or measure. --
{Com*men"su*ra*ble*ness}, n.
[1913 Webster]
{Commensurable numbers} or {Commensurable quantities}
(Math.), those that can be exactly expressed by some
common unit; thus a foot and yard are commensurable, since
both can be expressed in terms of an inch, one being 12
inches, the other 36 inches.
{Numbers commensurable in power}, or {Quantities
commensurable in power}, those whose squares are
commensurable.
[1913 Webster]