half-sisterˈhalf-ˌsister ●●○ noun [countable] 
Examples
ExamplesEXAMPLES FROM THE CORPUS
Thesaurus- Apart from his brother, he had one sister, one half-brother, and two half-sisters.
- Mitchell rented it from the half-sister of the owner, a schoolteacher gone to Toronto with her three chil-dren.
- Mrs Aitken, meet Shiona Fergusson, Kirsty's half-sister.
- Mrs Grant invites her younger half-sister Mary Crawford to live with her at the parsonage.
- The bees, they found, were more aggressive towards half-sisters.
- The more substantial is that the justices directed that T.'s contact with her older half-sister should be supervised.
- Tut, meanwhile, married his half-sister, Ankhesenamen.
Longman Language Activatorpeople who are related to you because of marriage► mother-in-law/son-in-law etc
a sister who is the daughter of only one of your parents → half-brother someone who is related to you because of a marriage, for example, your mother-in-law is the mother of your wife or husband, and your sister-in-law is the sister of your wife or husband, or the wife of your brother: · Surprisingly, my mother-in-law and I get along very well.· My sister and brother-in-law are coming to visit next week.
► stepmother/stepson/stepsister etc someone who becomes your mother, sister, son etc when you or a person you are related to marries for a second time: · After my mother got remarried, it took a while to get used to having a stepfather.· She has two sisters and a stepbrother.
► half-brother/half-sister someone who is the child of one of your parents but not both of them: · Alyssa has a half-brother she's never met because her parents don't speak to each other any more.
► by marriage if you are related to someone by marriage , they are married to someone in your family or you are married to someone in their family: · John's my cousin by marriage.
► in-laws informal the parents of your husband or wife: · We lived with my in-laws until we had enough money to buy a house of our own.
WORD SETS► Familybaby, nounbarrier method, nounbetrothal, nounboy, nounBr., branch, nouncontraception, nouncousin, noundescendant, noundescent, noundistant, adjectivedivorce, noundivorce, verbdivorced, adjectivedivorcée, noundomestic, adjectivedowry, noundynasty, nounex, nounextended family, nounfamilial, adjectivefamily man, nounfamily planning, nounfamily tree, nounfather, nounfather-in-law, nounfiancé, nounfiancée, nounfilial, adjectivefirst cousin, noungodchild, noungoddaughter, noungrandad, noungrandaddy, noungrandchild, noungranddad, noungranddaddy, noungranddaughter, noungrandfather, noungrandma, noungrandmother, noungrandpa, noungrandparent, noungrandson, noungranny, nounhalf-brother, nounhalf-sister, nounhereditary, adjectivehouse husband, nounin-laws, nounintermarry, verbmaiden aunt, nounmaid of honour, nounmam, nounmama, nounmamma, nounmammy, nounman, nounmarital, adjectivematrimony, nounmiscegenation, nounmixed marriage, nounmonogamy, nounnuclear family, nounoedipal, adjectiveOedipus complex, nounone-parent family, nounparent, nounparentage, nounparental, adjectiveparenthood, nounparenting, nounpaternity, nounpaternity suit, nounpatriarch, nounpatriarchy, nounpedigree, nounpolygamy, nounpropinquity, nounproposal, nounrelative, nounscion, nounseparate, verbseparated, adjectiveseparation, nounsibling, nounsingle parent, nounsister, nounsister-in-law, nounstepbrother, nounstepchild, nounstepdaughter, nounstepfather, nounstepmother, nounstepsister, nounstepson, noununcle, noununion, noununmarried, adjectiveupbringing, nounwedding, nounwedlock, nounwhite wedding, nounwidow, nounwidower, nounwidowhood, noun