Webster's English Dictionary

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obligate

1. ob.li.gate \'a:b-li-g*t, -l*-.ga-t\ aj 1: restricted to a particular 
   mode of life {an ~ parasite}  2: ESSENTIAL, NECESSARY  - ob.li.gate.ly av
2. ob.li.gate \'a:b-l*-.ga-t\ vt [L obligatus, pp. of obligare] 1a: to bind 
   legally or morally : CONSTRAIN  1b: OBLIGE  2: to commit (as funds) to meet 
   an obligation