fa ‧ vou ‧ ri ‧ tis ‧ m BrE AmE British English , favoritism American English /ˈfeɪv ə rətɪz ə m, ˈfeɪv ə rɪtɪz ə m/ noun [uncountable]
when you treat one person or group better than others, in an unfair way ⇨ favourite :
their favouritism towards their first son