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Reference.org
First-class citizen
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<p>In a given <a href="/facts/Programming_language/cWTYbgWa">programming language design</a>, a first-class citizen is an entity which supports all the operations generally available to other entities. These operations typically include being passed as an <a href="/facts/Parameter_(computer_programming)/LcuLbbSq">argument</a>, returned from a <a href="/facts/Function_(computer_programming)/9vFJrg0A">function</a>, and assigned to a <a href="/facts/Variable_(computer_science)/VoCKtwml">variable</a>. </p>