place·hold·er 
(plāshōl′dər)
(plāshōl′dər)n.
1. One who holds an office or place, especially as a deputy, proxy, or appointed government official.
2. In a mathematical or logical expression, a symbol that may be replaced by the name of any element of a set.
3. In the decimal form of a number, a digit that is not significant.
- generalship
- general staff
- general store
- generate
- generating station
- generation
- generational
- generationally
- generation gap
- Generation X
- Generation Xer
- Generation Y
- generative
- generative cell
- generative grammar
- generator
- generatrix
- generic
- generically
- genericity
- genericize
- genericness
- generosity
- generous
- generously