twin
A twin is one of two children born at the same time to the same mother. It can also refer to one of two things that are exactly the same or very similar.
Examples
3 of 5My twin brother and I share the same birthday.
My twin brother and I share the same birthday.
The researchers are conducting a study on identical twins.
The researchers are conducting a study on identical twins.
We are totally twins today because we are wearing the same hat!
We are totally twins today because we are wearing the same hat!
Antonyms
Word Family
Memory Tip
Look at the first two letters 'TW'. This is the same start as the word 'TWO'. A twin is one of TWO children.
Quick Quiz
Mary and her ___ brother both have curly hair and blue eyes.
Correct!
The correct answer is: twin
Examples
My twin brother and I share the same birthday.
everydayMy twin brother and I share the same birthday.
The researchers are conducting a study on identical twins.
formalThe researchers are conducting a study on identical twins.
We are totally twins today because we are wearing the same hat!
informalWe are totally twins today because we are wearing the same hat!
The biological development of twin embryos can vary significantly.
academicThe biological development of twin embryos can vary significantly.
The company decided to launch twin marketing campaigns in Europe and Asia.
businessThe company decided to launch twin marketing campaigns in Europe and Asia.
Antonyms
Word Family
Common Collocations
Common Phrases
twin towns
two towns in different countries paired for cultural exchange
the twin towers
two tall buildings that look the same
evil twin
a humorous way to describe someone who looks like you but behaves badly
Often Confused With
A triplet is one of three babies born together, while a twin is one of two.
A double is a lookalike, but they do not necessarily have the same parents or birth date.
Usage Notes
The word is most commonly used as a noun, but it can also act as an adjective (e.g., 'twin brother'). When referring to both people, always use the plural 'twins'.
Common Mistakes
Learners often forget to use 'twins' in the plural when talking about both siblings. For example, saying 'They are twin' instead of 'They are twins'.
Memory Tip
Look at the first two letters 'TW'. This is the same start as the word 'TWO'. A twin is one of TWO children.
Word Origin
Derived from Old English 'twinn', meaning 'twofold' or 'double', which comes from the root of the word 'two'.
Grammar Patterns
Cultural Context
In many countries, 'twin towns' or 'sister cities' are established to promote trade and tourism between two different locations.
Quick Quiz
Mary and her ___ brother both have curly hair and blue eyes.
Correct!
The correct answer is: twin
Related Grammar Rules
Related Vocabulary
More Family words
father
A1A father is a male parent of a child. This term describes both the biological relationship and the social role of a man who raises and cares for his children.
dad
A1An informal and affectionate name for a father, used primarily by children or within a family context. It refers to a male parent who provides care and support for his offspring.
mother
A1A female parent who has given birth to or raised a child. It is also used more broadly to describe a woman who provides care, protection, and support to another person.
son
A1A male child or man in relation to his parents. It is a fundamental kinship term used to describe a direct male descendant in a family.
child
A1A young human being below the age of puberty or the legal age of majority. It can also refer to a son or daughter of any age in relation to their parents.
sister
A1A sister is a girl or woman who shares the same parents as another person. It can also refer to a woman who shares one parent or someone who is very close like a family member.
baby
A1A baby is a very young human being, typically from birth until they start to walk. It is a general term for an infant who requires complete care and attention from adults.
toddler
A1A young child who is just beginning to walk, typically between the ages of one and three. This term describes the developmental stage between infancy and the start of preschool.
adult
A1A person who is fully grown and developed, typically someone who is 18 years of age or older. It is used to distinguish a mature individual from a child or a teenager.
wife
A1A wife is a female partner in a marriage. It refers to a woman who is legally or formally joined to another person in a marital relationship.
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