That which belongs to something else; an appurtenant.(noun)
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Use "appertinent" in a sentence
"The first wae of worshippyng God (say thei) was deuised and taught emonge theim: with the maners and ceremonies there to appertinent."
"This, by canonicalle decree, in time paste was not wonte to be giuen (excepte greate necessitie soner required it) but to those that had bene scholers a space afore, to learne the thinges appertinent to Christendome."
"And I, tough senior, as an appertinent title to your old time, which we may name tough."