The definition of epilepsy is more than one seizure. The frequency of seizures in people with epilepsy varies.
[patient.info]
What Is Childhood Absence Epilepsy?
[chp.edu]
EPILEPSY, CHILDHOOD ABSENCE, SUSCEPTIBILITY TO, 1 EPILEPSY, CHILDHOOD ABSENCE, SUSCEPTIBILITY TO, 5 EPILEPSY, CHILDHOOD ABSENCE, SUSCEPTIBILITY TO, 6 FEBRILE SEIZURES, FAMILIAL
[ghr.nlm.nih.gov]