Dictionary.net

The act of substituting or putting one person or thing in the place of another; as, the substitution of an agent, attorney, or representative to act for one in his absense; the substitution of bank notes for gold and silver as a circulating medium.

The state of being substituted for another.

The office or authority of one acting for another; delegated authority.

The designation of a person in a will to take a devise or legacy, either on failure of a former devisee or legatee by incapacity or unwillingness to accept, or after him.

The doctrine that Christ suffered vicariously, being substituted for the sinner, and that his sufferings were expiatory.

The act or process of substituting an atom or radical for another atom or radical; metethesis; also, the state of being so substituted. See Metathesis.

The art of putting, or state of being put, in place of another.

The act of filling a prescription with a different or spurious make of drugs than those designated.

Act of substituting or putting in place of another.

SUBSTITUTIONAL.

Act of substituting.

Chemical replacement of one substance by another.

In chemistry, the process of replacing one or more atoms in a molecule by other atoms or radicles.

In physiology and pathology, compensatory or vicarious action; a manifestation of disease in alternation with another and especially a nervous disorder; of French writers, replacement of the tissue of an organ by an inflammatory product.

In pharmacy, the sale of a substitute for an article prescribed or asked for.

In psycho-analysis the carrying over of an emotional conflict to an indifferent idea.

n. Act of putting one person or thing in the place of another;-state of being substituted for another person or thing;-in grammar, syllepsis, or the use of one word for another ;-in law, the delegation of one or more parties to enjoy the estate in default of the first heir or after him ;-in algebra, the putting of a simpler quantity in place of a more complex, as in solving equations ;-in theology, the doctrine that Christ suffered vicariously, or in the room and stead of sinners.