1. • noun - the act of furnishing an equivalent person or thing in the place of another
   • noun - someone who takes the place of another person
   • noun - an event in which one thing is substituted for another
   • noun - a person or thing that takes or can take the place of another
   • noun - filling again by supplying what has been used up
   • noun - a person who follows next in order
2. • The act or process of replacing or of being replaced; substitution.
   • One that replaces, especially a person assigned to a vacant military position.

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