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External

/ɪkˈstɜːnl/

Connected or related to the outside or outer part of something, often referring to something not deeply inherent to a main subject.

Synonyms:

Often, thoughts are triggered due to external stimuli.

Additionally, the Big Snooze is reinforced by external sources.

They did not feel obliged or expect external rewards.

Comes from the Latin word externus, a combination of ex- meaning out of and ternus meaning ternal or belonging.

25 mentions per 1 million words

Often

Hint: Frequency according to COCA