first appearance

NOUN
16 LETTERS · STARTS WITH F

first appearance is a valid 16-letter word worth 24 points in Scrabble and 28 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
F4I1R1S1T1A1P3P3E1A1R1A1N1C3E1
4 + 1 + 1 + 1 + 1 + 0 + 1 + 3 + 3 + 1 + 1 + 1 + 1 + 1 + 3 + 1 =24 PTS
DOUBLE WORD → 48TRIPLE WORD → 72
MEANING

What does first appearance mean?