2 definitions found From WordNet (r) 2.0 [wn]: substituting noun: working as a substitute for someone who is ill or on leave of absence [syn: {subbing}] From The Collaborative International Dictionary of English v.0.44 [gcide]: Substitute \Sub"stit"ute\, verb (used with an object) [imp. & p. p. {Substituted}; p. pr. & vb. n. {Substituting}.] [See {Substitute}, noun] To put in the place of another person or thing; to exchange. Some few verses are inserted or substituted in the room of others. --Congreve.

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