Meaning of “on demand” in the English Dictionary

"on demand" in British English

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on demand

at any time that someone wants or needs something:

They believe that abortion should be available on demand.
The heat-controlled implant delivers insulin on demand.

available when a customer wants or asks for something:

They will sell a voice recognition product as an add-on, on-demand service for their users.
In the library's warehouse, robots would manage stock and fetch books on an on-demand basis.

able to be watched at any time:

Most people in this region do not even have television, let alone on-demand movies.

See also

a service for watching films or TV programmes at any time:

Cable customers pay an extra $6.95 a month for on-demand.

(Definition of “on demand” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)