placeholder

[pleys-hohl-der]

place·hold·er

[pleys-hohl-der]
noun
1.
Mathematics, Logic. a symbol in an expression that may be replaced by the name of any element of the set.
2.
a person who holds a government office, especially one appointed to the position in return for political support or favors.

Origin:
1550–60; place + holder
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Placeholder is always a great word to know.
So is precalculus. Does it mean:
a relation of four quantities such that the first divided by the second is equal to the third divided by the fourth; the equality of ratios
pertaining to the mathematical prerequisites for the study of calculus, as algebra, analytical geometry, and trigonometry
WordNet
placeholder

noun
1. a person authorized to act for another [syn: proxy
2. a symbol in a logical or mathematical expression that can be replaced by the name of any member of specified set 
WordNet® 3.0, © 2006 by Princeton University.
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