WordWeb Online

1. Not far distant in time, space, degree or circumstances
   "nigh neighbours";
   - near, close
    
2. Being on the left side
   "the near or nigh horse is the one on the left"; "the animal's left side is its near or nigh side";
   - near

1. Not far away in position, relationship or time
   "The end draws nigh";
   - near, close
    
2. (of actions or states) slightly short of or not quite accomplished; all but
   "talked for nigh onto 2 hours"; "the recording is well-nigh perfect";
   - about, almost, most, nearly, near, virtually, well-nigh, all but

See also: adjacent, distance, hot [informal], left, nearby, warm [informal]

Encyclopedia: Nigh, William