Definition of equivalent:

part of speech: noun

That which is equal in value, weight, & c., to something else; offset; compensation; in geol., strata or a series of strata that have been formed contemporaneously in distant regions, or which are characterised by similar suites of fossils.

part of speech: adjective

Equal in value or worth; equal in power, force, or effect; of the same import or meaning.

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To furnish with arms; to take up arms. ...