(1):

(superl.) Nearly raw; partially cooked; not thoroughly cooked; underdone; as, rare beef or mutton.

(2):

(a.) Early.

(3):

(superl.) Not frequent; seldom met with or occurring; unusual; as, a rare event.

(4):

(superl.) Of an uncommon nature; unusually excellent; valuable to a degree seldom found.

(5):

(superl.) Thinly scattered; dispersed.

(6):

(superl.) Characterized by wide separation of parts; of loose texture; not thick or dense; thin; as, a rare atmosphere at high elevations.