/ eə(r); NAmE er/ noun heir (to sth) | heir (of sb)
1.
a person who has the legal right to receive sb's property, money or title when that person dies :
to be heir to a large fortune
the heir to the throne (= the person who will be the next king or queen)
2.
a person who is thought to continue the work or a tradition started by sb else :
the president's political heirs
HELP NOTE : Use an , not a , before heir .
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WORD ORIGIN
Middle English : via Old French from Latin heres .