Meaning of -IST in English

-ist /əst, ɪst/ BrE AmE suffix

[ Language: Old French ; Origin: -iste , from Latin -ista , -istes , from Greek -istes , from verbs ending in -izein ; ⇨ ↑ -ize ]

1 . [in nouns] someone who believes in a particular religion or set of principles or ideas:

a Buddhist

an atheist

a Scottish Nationalist

2 . [in adjectives] relating to or showing a particular political or religious belief:

her socialist views

rightist parties (=political parties with ↑ right-wing opinions)

3 . [in nouns] someone who studies a particular subject, plays a particular instrument, or does a particular type of work:

a linguist (=someone who studies or learns languages)

a novelist (=someone who writes ↑ novel s )

a guitarist (=someone who plays the ↑ guitar )

a machinist (=someone who operates a machine)

⇨ ↑ -ologist

4 . [in adjectives] treating people unfairly because of something:

a very sexist remark (=making unfair differences between men and women)

5 . [in nouns] someone who treats people unfairly because of something:

They’re a bunch of racists.

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