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Related to on demand: Video on demand
at any time that you want or need something With cable, you can order movies on demand, but naturally you have to pay for them.
When needed or asked for, as in She's always ready to sing on demand, or Nowadays infants are generally fed on demand. This usage is a broadening of this phrase's meaning in finance, that is, "payable on being requested or presented," as in This note is payable on demand. [Late 1600s]
1. When presented for payment: a note payable on demand.
2. When needed or asked for: fed the baby on demand.