from The American Heritage® Dictionary of the English Language, 4th Edition
- n. One who holds an office or place, especially:
- n. One who acts as a deputy or proxy.
- n. One who holds an appointed office in a government.
- n. In a mathematical or logical expression, a symbol that may be replaced by the name of any element of a set.
- n. In the decimal form of a number, a digit that is not significant.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Something used or included temporarily or as a substitute for something that is not known or must remain generic; that which holds, denotes or reserves a place for something to come later.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a person authorized to act for another
- n. a symbol in a logical or mathematical expression that can be replaced by the name of any member of specified set
place + holder. (Wiktionary)