Used or held in reserve

• auxiliary

  1. Designating or of any of the noncombat ships, as tankers or tenders, that form the service fleet of a navy
  2. Held in or used as a reserve:
  3. Additional; supplementary; reserve

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  1. Designating or of any of the noncombat ships, as tankers or tenders, that form the service fleet of a navy
  2. Held in or used as a reserve:
  3. Additional; supplementary; reserve

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• backup

  1. Extra; standby:
  2. Alternative spelling of backup.
  3. Of or having to do with the backing up of computer data, files, etc.

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  1. Extra; standby:
  2. Alternative spelling of backup.
  3. Of or having to do with the backing up of computer data, files, etc.

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• emergency

  1. For use in case of sudden necessity
  2. Related to the emergency or to the provision of assistance.

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  1. For use in case of sudden necessity
  2. Related to the emergency or to the provision of assistance.

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• reserve

  1. Being, or having the nature of, a reserve or reserves
  2. Held in or forming a reserve:

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  1. Being, or having the nature of, a reserve or reserves
  2. Held in or forming a reserve:

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• secondary

  1. Derived from what is primary or original:
  2. Second or lower in rank or importance; not primary:
  3. Of or relating to secondary schools.

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  1. Derived from what is primary or original:
  2. Second or lower in rank or importance; not primary:
  3. Of or relating to secondary schools.

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• standby

  1. Of, for, or functioning as a standby
  2. Of, relating to, or waiting for unreserved travel space that is made available by an airline only shortly before departure:
  3. Kept in reserve for use when needed:

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  1. Of, for, or functioning as a standby
  2. Of, relating to, or waiting for unreserved travel space that is made available by an airline only shortly before departure:
  3. Kept in reserve for use when needed:

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• supplemental

  1. Appending.
  2. Acting to supplement.
  3. Lacking a regular schedule (as in a supplemental airline).

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  1. Appending.
  2. Acting to supplement.
  3. Lacking a regular schedule (as in a supplemental airline).

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