/
dɪˈmɛnʃ(ə)n, 
dʌɪ-/
n.
  - a measurable extent, such as length, breadth, or height. 
▸Physics  an expression for a derived physical quantity in terms of fundamental quantities such as mass, length, or time, raised to the appropriate power (acceleration, for example, having the dimension of length × time-2).
 - an aspect or feature:
 the cultural dimensions of the problem.
 
v.
 cut or shape to particular dimensions. 
▸
[usu. as adj. dimensioned]
 mark (a diagram) with dimensions.
Derivative
- -dimensional adj.
  - dimensionally adv.
  - dimensionless adj.
 
Etymology
ME: via OFr. from L. dimensio(n-), from dimetiri ‘measure out’.