Read the dictionary definition of rare. All definitions for this word.
1. not widely distributed
1. rare herbs
2. rare patches of green in the desert
2. not widely known; especially valued for its uncommonness
1. a rare word
2. rare books
3. (of meat) cooked a short time; still red inside
1. rare roast beef
4. recurring only at long intervals
1. a rare appearance
2. total eclipses are rare events
5. marked by an uncommon quality; especially superlative or extreme of its kind
1. what is so rare as a day in June
2. a rare skill
3. an uncommon sense of humor
4. she was kind to an uncommon degree
6. having low density
1. rare gasses
2. lightheaded from the rarefied mountain air