Placeholder Definition

plāshōldər
placeholders
noun
One who holds an office or place, especially as a deputy, proxy, or appointed government official.
American Heritage
In a mathematical or logical expression, a symbol that may be replaced by the name of any element of a set.
American Heritage
In the decimal form of a number, a digit that is not significant.
American Heritage

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.

This is placeholder data, so you'll want to include the real numbers as soon as you have them.
Wiktionary
Synonyms:

Other Word Forms of Placeholder

Noun

Singular:
placeholder
Plural:
placeholders

Origin of Placeholder

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