Definitions of rare:

  • adjective:   marked by an uncommon quality; especially superlative or extreme of its kind
    Example: "What is so rare as a day in June-J.R.Lowell"
  • adjective:   having low density
    Example: "Rare gasses"
  • adjective:   not widely distributed
    Example: "Rare herbs"
  • adjective:   not widely known; especially valued for its uncommonness
    Example: "A rare word"
  • adjective:   (of meat) cooked a short time; still red inside
    Example: "Rare roast beef"
  • adjective:   recurring only at long intervals
    Example: "A rare appearance"