Wordnet 3.0
ADJECTIVE (1)
1. 
 constructed with standardized units or dimensions allowing flexibility and variety in use; 
- Example: "modular furniture"- Example: "modular homes"
The Collaborative International Dictionary of English v.0.48:
Modular \Mod"u*lar\, a.
   Of or pertaining to mode, modulation, module, or modius; as,
   modular arrangement; modular accent; modular measure.
   [1913 Webster]
WordNet (r) 3.0 (2006):
modular
    adj 1: constructed with standardized units or dimensions
           allowing flexibility and variety in use; "modular
           furniture"; "modular homes"