The difference between Brother and Sister
When used as nouns, brother means son of the same parents as another person, whereas sister means a daughter of the same parents as another person.
When used as verbs, brother means to treat as a brother, whereas sister means to strengthen (a supporting beam) by fastening a second beam alongside it.
check bellow for the other definitions of Brother and Sister
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Brother as a noun:
Son of the same parents as another person.
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Brother as a noun:
A male having at least one parent in common with another (see half-brother, stepbrother).
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Brother as a noun:
A male fellow member of a religious community, church, trades union etc.
Examples:
"Thank you, brother."
"I would like to thank the brother who just spoke."
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Brother as a noun (African American Vernacular English):
A black male.
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Brother as a noun:
Somebody, usually male, connected by a common cause or situation.
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Brother as a noun:
Someone who is a peer, whether male or female.
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Brother as a verb (transitive):
To treat as a brother.
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Sister as a noun:
A daughter of the same parents as another person; a female sibling.
Examples:
"My sister is always driving me crazy."
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Sister as a noun (informally):
A female member of a religious order; especially one devoted to more active service; a nun.
Examples:
"Michelle left behind her bank job and became a sister at the local convent."
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Sister as a noun:
Any butterfly in the genus , so named for the resemblance of the dark-colored wings to the black habit traditionally worn by nuns.
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Sister as a noun (British):
A senior or supervisory nurse, often in a hospital.
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Sister as a noun:
Any woman or girl with whom a bond is felt through common membership of a race, profession, religion or organization, such as feminism.
Examples:
"Connie was very close to her friend Judy and considered her to be her sister."
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Sister as a noun (slang):
A black woman.
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Sister as a noun (informal):
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Sister as a noun:
A woman, in certain labour or socialist circles; also as a form of address.
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Sister as a noun (attributively):
An entity that has a special or affectionate, non-hierarchical relationship with another.
Examples:
"sister publication, sister city, sister projects"
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Sister as a noun (comptheory):
A node in a data structure that shares its parent with another node.
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Sister as a noun (usually, attributively):
Something in the same class.
Examples:
"sister ships'', ''sister facility"
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Sister as a verb (transitive, construction):
To strengthen (a supporting beam) by fastening a second beam alongside it.
Examples:
"I’m trying to correct my sagging floor by sistering the joists."
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Sister as a verb (obsolete, transitive):
To be sister to; to resemble closely.