(psychology) The understanding (typically developed during early infancy) that an object still exists even when it disappears from sight, or other senses.
Wiktionary
Object-permanence Sentence Examples
The laws of object permanence are nullified for " cool " characters.
Children acquire object permanence at about seven months of age (memory).
Object performance activities are also called relational activities and the goal is to reinforce object permanence with your preschooler.
