noun
a word or phrase that comes after a noun to provide additional information about it
adjective
relating to or occurring after a noun
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In academic writing, it is common to use postnominal letters to indicate someone's qualifications.
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She always adds a bunch of postnominal letters after her name on social media.
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I don't know what all those postnominal things mean, but they sound fancy.
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His postnominal titles were like a shield, protecting him from any doubts about his expertise.