[...] in a situation where there is a two-way opposition between a marked element of limited distribution and an unmarked default element, overapplication is the appearance of the marked element outside of its normal distributional domain.
- McCarthy & Prince (2004), Pag. 381

[...] three types of overapplication - base to reduplicant, reduplicant to base, and interactional [...].
- McCarthy & Prince (2004), Pag. 411

If the relevant phonological rule applies to the base, its output is copied; this is overapplication, ordering-wise.
- McCarthy & Prince (2004), Pag. 386

It may happen that parallel phonological developments occurr in both the base and the copy, even though the regular triggering conditions are found only in one or the other. This is "overapplication".
- McCarthy & Prince (2004), Pag. 370