Search Result for "synonymousness": 
Wordnet 3.0

NOUN (1)

1. the semantic relation that holds between two words that can (in a given context) express the same meaning;
[syn: synonymy, synonymity, synonymousness]



WordNet (r) 3.0 (2006):

synonymousness
    n 1: the semantic relation that holds between two words that can
         (in a given context) express the same meaning [syn:
         synonymy, synonymity, synonymousness]