The conviction that an object remains perceptually constant over time and exists even when it is out of sight. According to Piaget, this does not develop until infants are eight months old or more.

Mental capacity, obtained by most children at around seven months, to understand that an object still exists even when it is out of sight.

A key part of cognitive development, when a baby understands that an object still exists even though it is not necessarily in sight.

A cognitive milestone, usually reached in the second or third year, when achild is able to understand that an object exists even when it's out ofview.

an ability to know that something still exists even though it cannot be seen.

the realization that objects exist even when they are no longer visible. (119)

Piaget?s term for the child?s realization that an object continues to exist even though it is hidden from view. See also sensorimotor stage.

Object permanence is the term used to describe the awareness that objects continue to exist even when they are no longer visible.