Cancel or cancellation may refer to:
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Flight cancellation and delay, not operating a scheduled flight
Sociology
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Cancel culture
Cancel culture, or rarely also known as call-out culture, is a phrase contemporary to the late 2010s and early 2020s used to refer to a form of ostracism in which someone is thrust out of social or professional circles—whether it be online, o ...
, boycott and ostracism calling out offensive behavior on social media or in real life
Technology and science
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Cancel leaf, a bibliographic term for replaced leaves in printed books
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Cancellation property
In mathematics, the notion of cancellative is a generalization of the notion of invertible.
An element ''a'' in a magma has the left cancellation property (or is left-cancellative) if for all ''b'' and ''c'' in ''M'', always implies that .
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, the mathematical property if ''a''×''b'' = ''a''×''c'' then ''b'' = ''c''
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Cancelling out, a technique for simplifying mathematical expressions
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Catastrophic cancellation
In numerical analysis, catastrophic cancellation is the phenomenon that subtracting good approximations to two nearby numbers may yield a very bad approximation to the difference of the original numbers.
For example, if there are two studs, one L ...
, numerical error arising from subtracting approximations to nearby numbers
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Noise cancellation
Active noise control (ANC), also known as noise cancellation (NC), or active noise reduction (ANR), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first develo ...
, a method for reducing unwanted sound
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Phase cancellation
In physics, interference is a phenomenon in which two waves combine by adding their displacement together at every single point in space and time, to form a resultant wave of greater, lower, or the same amplitude. Constructive and destructive ...
, the effect of two waves that are out of phase with each other being summed
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Cancel message, a special message used to remove Usenet articles posted to news servers
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