n.
- The act or an instance of substituting.
- The state of being substituted.
- One that is substituted; a replacement.
substitutionally sub'sti·tu'tion·al·ly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.