Webster's English Dictionary

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volunteer

1. vol.un.teer \.va:l-*n-'ti(*)r\ n [obs. F voluntaire (now volontaire), 
   fr. voluntaire, adj., vo]luntary, fr. L voluntarius 1: one who enters into 
   or offers himself for any service of his own free wi ll : as 1a: one who 
   enters into military service voluntarily  1b1: one who renders a service or 
   takes part in a transaction while having  no legal concern or interest 1b2: 
   one who receives a conveyance or transfer of property without giving v 
   aluable consideration 2: a volunteer plant 
2. volunteer aj 1: of, relating to, or consisting of volunteers : VOLUNTARY 
    2: growing spontaneously without direct human control or supervision esp.  
   from seeds lost from a previous crop
3. volunteer vt : to offer or bestow voluntarily {~ one's services} to 
   offer on eself as a volunteer