Webster's English Dictionary

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incumbent

1. in.cum.bent \in-'k*m-b*nt\ n [ME, fr. L incumbent-, incumbens, prp. of 
   incumbere to lie do]wn on, fr. in- + -cumbere to lie down; akin to L cubare 
   to lie - more at HIP : the holder of an office or ecclesiastical benefice 
2. incumbent aj 1a: lying or resting on something else  of a geologic 
   stratum  1b: SUPERIMPOSED, OVERLYING  2: imposed as a duty : OBLIGATORY  3: 
   occupying a specified office  archaic  4a: bending over : OVERHANGING  obs  
   4b: IMPENDING  4c: bent over so as to rest on or touch an underlying 
   surface