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Definitions of indef:
adjective: (Wikimedia jargon, Internet slang) Of a user, account, or IP address: blocked or banned from editing or other actions for an indefinite length of time.
noun: (Wikimedia jargon, Internet slang) The action of blocking or banning a user, account, or IP address from editing or other actions for an indefinite length of time.
verb: (Wikimedia jargon, Internet slang) To block or ban a user, account, or IP address from editing or other actions for an indefinite length of time.
adjective: Abbreviation of indefinite. [Without limit; forever, or until further notice; not definite.]