1. In psychology and behavioral science, a schedule of reinforcement in which a reward is given after an unpredictable or changing amount of time has elapsed
The researcher used a variable interval schedule to study the rat's response patterns.
O pesquisador usou um intervalo variável para estudar os padrões de resposta do rato.
2. In mathematics and engineering, a space or distance between two points that changes or fluctuates
The machine operates with a variable interval between cycles.
A máquina opera com um intervalo variável entre ciclos.