In its general sense, 'delay' refers to a lapse of time. In other contexts, it may refer to one of many topics:
People
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B.H. DeLay, French-American aviator actor
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Dorothy DeLay
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Florence Delay, a French academic and actress
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Jan Delay, a German musician
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Tom DeLay, an American politician
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Vladislav Delay, a Finnish musician
Law
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To delay payment of a debt, a crime in the United Kingdom
Telecommunications and broadcasting
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Broadcast delay, a practice of time-shifting transmissions
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Delay encoding, a radio transmission technique
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Network delay, the delay of an IP packet within an IP network
Physics and electronics
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Propagation delay, a measurement of the time for a signal to reach its destination
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Delay line, one of any technologies for shifting a signal in time
Audio
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Delay (audio effect), a technology for producing delayed playback of an audio signal
Computer Science
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Delay (programming), a programming language construct for delaying evaluation of an expression