dimensionphoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticphoneticnoun [C]
1. a measurement (of something) in a particular direction, esp. its height,
     length or width, or a part or feature or way of considering

  Please specify the dimensions (=the height, length and width) of the room.
   It will be a building of vast dimensions (=size).

dimensionalphoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticPhoneticphoneticcombining form
  1. Space is considered to be three-dimensional (=having three measurements
       in different directions) and time is thought of as the fourth dimension.

      The two groups form part of a larger multi-dimensional(=having many parts)
      organization.

This page is cited from Cambridge Dictionaries Online.  For the original, please visit
http://dictionary.cambridge.org/define.asp?key=dimension*1+0