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Retract
In topology, a branch of mathematics, a retraction is a continuous mapping from a topological space into a subspace which preserves the position of all points in that subspace. A deformation retraction is a mapping which captures the idea of continuously shrinking a space into a subspace.
An absolute neighborhood retract (ANR) is a particularly well-behaved type of topological space. For example, every topological manifold is an ANR. Every ANR has the homotopy type of a very simple topological space, a CW complex.
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Redact (verb)
To censor, to black out or remove parts of a document while releasing the remainder.
“The military will redact the document before releasing it, blacking out sections that are classified.”
“The names and email addresses of the users were redacted from the public data.”
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Redact (verb)
To black out legally protected sections of text in a document provided to opposing counsel, typically as part of the discovery process.
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Redact (verb)
To reduce to form, as literary matter; to digest and put in shape (matter for publication); to edit. from 19th c.
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Redact (verb)
To draw up or frame a decree, statement, etc. from 19th c.
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Redact (verb)
To bring together in one unit; to combine or bring together into one. 15th-16th c.
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Redact (verb)
To gather or organize works or ideas into a unified whole; to collect, order, or write in a written document or to put into a particular written form. 15th-17th c.
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Redact (verb)
To insert or assimilate into a written system or scheme. 16th c.
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Redact (verb)
To bring an area of study within the comprehension capacity of a person. 17th c.
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Redact (verb)
To reduce to a particular condition or state, especially one that is undesirable. 16th-18th c.
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Redact (verb)
To reduce something physical to a certain form, especially by destruction. 16th-17th c.
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Retract (verb)
To pull back inside.
“An airplane retracts its wheels for flight.”
“The wheelchair ramp on the bus wouldn’t retract after use, it required persuasion by hand before the bus could move.”
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Retract (verb)
To draw back; to draw up.
“Muscles retract after amputation.”
“A cat can retract its claws.”
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Retract (verb)
To take back or withdraw something one has said.
“I retract all the accusations I made about the senator and sincerely hope he won’t sue me.”
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Retract (verb)
To take back, as a grant or favour previously bestowed; to revoke.