Webster's English Dictionary

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install

in.stall or in.stal \in-'sto.l\ vt or in.stalled;  or in.stall.ing [MF 
   installer, fr. ML installare, fr. L in- + ML stallumX, stall, fr. OHG stal 
   1a: to place in office or dignity by seating in a stall or official seat  
   1b: to induct into an office, rank, or order  2: to establish in an 
   indicated place, condition, or status  3: to set up for use or service  - 
   in.stall.er n