Counterpart
Definition 1 of 2
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Functional Similarity
Refers to someone or something that serves a similar role or purpose. He was my counterpart at the partner company, handling similar projects.
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Across Contexts
Can be used in various fields, from business to sports, to describe equivalent roles. The foreign minister met with his American counterpart.
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Not Necessarily Equal
Doesn't imply equality in status or power, just a similar function. A teaching assistant is the counterpart to a teacher, not the equal.