routine (n.)

"customary course of action; more or less mechanical performance of certain acts or duties," 1670s, from French routine "usual course of action, beaten path" (16c.), from route "way, path, course" (see route (n.)) + noun suffix -ine (see -ine (1)). The theatrical or athletic performance sense of "carefully rehearsed sequence of actions" is by 1926. The adjective, "of a mechanical or unvaried character, habitually done in the same way" is attested by 1817, from the noun. Related: Routinely.

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Definitions of routine
routine (n.)
an unvarying or habitual method or procedure;
Synonyms: modus operandi
routine (n.)
a short performance that is part of a longer program;
she had a catchy little routine
Synonyms: act / number / turn / bit
routine (n.)
a set sequence of steps, part of larger computer program;
Synonyms: subroutine / subprogram / procedure / function
routine (adj.)
found in the ordinary course of events; "there's nothing quite like a real...train conductor to add color to a quotidian commute"- Anita Diamant;
it was a routine day