Meaning of DIFFERENTIAL in English

I. dif ‧ fe ‧ ren ‧ tial 1 /ˌdɪfəˈrenʃ ə l◂/ BrE AmE noun [countable]

1 . formal a difference between things, especially between the wages of people doing different types of jobs in the same industry or profession

pay/wage/salary differential

2 . technical a differential gear

II. differential 2 BrE AmE adjective

based on or depending on a difference:

differential rates of pay

differential treatment of part-time and full-time staff

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.