pe·ri·od·ic 
/ˌpiriˈɑ:dɪk/ adjective
always used before a noun /ˌpiriˈɑ:dɪk/ adjective : happening regularly over a period of time
▪ He takes the car in for periodic oil changes. ▪ She makes periodic [=regular] payments to the bank.
▪ He takes the car in for periodic oil changes. ▪ She makes periodic [=regular] payments to the bank.
— pe·ri·od·i·cal·ly /ˌpiriˈɑ:dɪkli/ adverb
▪ The directory is updated periodically.
/ˌpiriˈɑ:dɪkli/ adverb ▪ The directory is updated periodically.
