intermediate
US /ˌɪn.t̬ɚˈmiː.di.ət/
UK /ˌɪn.t̬ɚˈmiː.di.ət/

1.
coming between two things in time, place, order, character, etc.
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The course is designed for intermediate learners.
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They reached an intermediate stage in their negotiations.
1.
an intermediate person or thing
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The software acts as an intermediate between the user and the database.
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She served as an intermediate in the peace talks.