Etymology
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Words related to heredity

heir (n.)
"one who inherits, or has right of inheritance in, the property of another," c. 1300, from Anglo-French heir, Old French oir "heir, successor; heritage, inheritance," from Latin heredem (nominative heres) "heir, heiress" (see heredity). Heir apparent (late 14c.) has the French order of noun-adjective, though it was not originally so written in English. It is the heir of one still alive whose right is clear. After death the heir apparent becomes the heir-at-law. Related: Heir-apparency.
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hereditable (adj.)
mid-15c.; see heredity + -able. Perhaps from obsolete French héréditable or Medieval Latin hereditabilis. Related: Hereditably; hereditability (1829).
hereditament (n.)
"inherited property, anything that can be inherited" (as distinguished from property the ownership of which terminates with the death of the owner), mid-15c., from Medieval Latin hereditamentum, from Latin hereditatem (see heredity).
hereditary (adj.)
early 15c., "transmitted in a line of progeny," hereditarie, from Latin hereditarius "inherited; of or relating to an inheritance," from hereditas "heirship, inheritance" (see heredity). Oldest English sense of diseases; meaning "transmitted or held by inheritance" is from mid-15c.
hereditism (n.)
"scientific doctrine of hereditary transmission of characteristics," 1874; see heredity + -ism.
heritage (n.)
c. 1200, "that which may be inherited," from Old French iritage, eritage, heritage "heir; inheritance, ancestral estate, heirloom," from heriter "inherit," from Late Latin hereditare, ultimately from Latin heres (genitive heredis) "heir" (see heredity). Meaning "condition or state transmitted from ancestors" is from 1620s.
inherit (v.)
c. 1300, "to make (someone) an heir" (a sense now obsolete), from Old French enheriter "make heir, attribute the right of inheretance to, appoint as heir," from Late Latin inhereditare "to appoint as heir," from in- "in" (from PIE root *en "in") + Latin hereditare "to inherit," from heres (genitive heredis) "heir" (see heredity).

Sense of "receive inheritance, get by succession as representative of the former possessor" is attested from mid-14c.; in Medieval Latin inhereditare also had taken on a sense "put in possession." Original sense is retained in disinherit. Related: Inherited; inheriting; inheritable.