What does tarot card size mean?
2 Answers
If you're asking for dimensions, what I found is Mayday sleeves for french tarot cards listing size as 61x112mm
And FFG "tarot sized" sleeves are 70x120mm
Tarot is played with 78 cards and at the beginning of the game a player's hand is quite big (18 cards for a 4-player game ; 15 for a 5-player game and 24 for a 3-player game). With an ordinary format (Poker or Bridge), it would be difficult to hold them, so Tarot cards are longer and narrower.
The measurements I found are 60mmx120mm.
More info (in French) on the wikipedia page