What is the meaning of -ist?

Added to words to form nouns denoting:

1. a person who studies or practices a particular discipline;

   a person who studies or practices a particular discipline;

   a person who uses a device of some kind;

   one who engages in a particular type of activity;

   one who suffers from a specific condition or syndrome

   one who subscribes to a particular theological doctrine or religious denomination;

   one who has a certain ideology or set of beliefs;

   one who owns or manages something;

   a person who holds bigoted, partial views with respect to a particular matter.

   a person who speaks or specializes in a (usually constructed) language.

   -ist, used to form nouns, usually relating to people, e.g. profession/occupation.

   appended to a word, it yields a noun which signifies the subject who performs something related to that word

   -ist

   alternative form of -est

   used to form nouns, usually relating to people.

   used to form nouns, usually relating to people.

   alternative form of -ost

   -ist

   Suffix appended to words to create a masculine noun, usually denoting a follower or a profession. Chiefly used for loanwords.

   -ist

   Source: wiktionary.org