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A person who is held in servitude as the property of another person, and whose labor (and often also whose body and life) is subject to the owner's volition and control.
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(figuratively) A drudge; one who labors or is obliged (e.g. by prior contract) to labor like a slave with limited rights, e.g. an indentured servant.
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(figuratively) An abject person.
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(figuratively) One who has no power of resistance to something, one who surrenders to or is under the domination of something.
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(BDSM) A submissive partner in a BDSM relationship who consensually submits to, sexually or personally, serving one or more masters or mistresses.
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A sex slave, a person who is forced against their will to perform, for another person or group, sexual acts on a regular or continuing basis.
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(engineering, computing, photography) A device (such as a secondary flash or hard drive) that is subject to the control of another (a master).