Wordnet 3.0
NOUN (1)
1. 
 a unit of information equal to 1000 kilobits or 10^6 (1,000,000) bits; 
[syn: megabit, Mbit, Mb]
WordNet (r) 3.0 (2006):
megabit
    n 1: a unit of information equal to 1000 kilobits or 10^6
         (1,000,000) bits [syn: megabit, Mbit, Mb]