Antonym: heiress. Similar words: their, weird, heist, height, atheist, heinous, polytheism, polytheistic. Meaning: [er /eə] 
n. 1. a person who is entitled by law or by the terms of a will to inherit the estate of another 2. a person who inherits some title or office.
n. 1. a person who is entitled by law or by the terms of a will to inherit the estate of another 2. a person who inherits some title or office. 
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1) He recognized John as his lawful heir.
2) They adopted an orphan as an heir.
3) John was the sole heir to a vast estate.
4) The guest of honour was the Romanoff heir to the throne of all Russia.
5) Her duty was to produce an heir to the throne.
6) By producing an heir, the Queen effectively removed her cousin's hopes of succeeding to the throne.
7) The treaty of Troyes made Henry V heir to the crown of France.
8) The only daughter took as heir.
9) He was the legal heir to the throne.
10) He has no heir to leave his fortune to.
11) Who was the true heir to the throne?
12) We don't recognized him to be the lawful heir.
13) The old man deceased without leaving an heir.
14) She acknowledged him as her heir.
15) We don't recognised him to be the lawful heir.
16) He was sole heir to the family fortune.
17) The French finance minister is heir to a tradition of central control that goes back to Louis XIV's minister, Colbert.
18) Richard was his father's only heir, as he had no brothers or sisters.
19) The young prince is the heir to a vast estate in the west of the country.
20) At the age of twenty he fell heir to a large estate.
21) He wanted an heir to carry on the family name.
22) It's only the second time a potential heir to the throne has married a commoner.
23) The King's eldest son is the heir to the throne.
24) Henry the Eighth wanted a male heir to ensure the Tudor line of succession.
25) The Prince of Wales is the heir apparent to the throne.
26) The marriage failed to produce an heir to the throne.
27) If he dies without an heir,(http://sentencedict.com/heir.html) his property reverts to the state.
28) Imam Ali, the prophet's son-in-law, is regarded by Shia Muslims as the heir to Mohammed's spiritual authority.
29) In the UK, it is customary for the next heir to the throne to be regent.
30) He left most of his property to his eldest son and heir.