Webster's English Dictionary

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instant

1. in.stant \'in(t)-st*nt\ n [ME, fr. ML instant-, instans, fr. instant-, 
   instans, a]dj., instant, fr. L 1: an infinitesimal space of time : MOMENT  
   2: the present or current month 
2. instant aj [ME, fr. MF or L; MF, fr. L instant-, instans, fr. prp. of 
   insta]re to stand upon, urge, fr. in- + stare to stand - more at STAND 1: 
   IMPORTUNATE, URGENT  2a: PRESENT, CURRENT  2b: of or occurring in the 
   present month  3: IMMEDIATE, DIRECT  4a: premixed or precooked for easy 
   final preparation  4b: immediately soluble in water  - in.stant.ness n