in·ter·val 
/ˈɪntɚvəl/ noun
plural in·ter·vals /ˈɪntɚvəl/ noun [count] 1 : a period of time between events : pause
▪ a three-month interval between jobs ▪ There might be long intervals during/in which nothing happens. ▪ The sun shone for brief intervals throughout the day. 2 music : the difference in pitch between two notes 3 Brit : intermission
▪ There will be a 20-minute interval between acts one and two.
▪ a three-month interval between jobs ▪ There might be long intervals during/in which nothing happens. ▪ The sun shone for brief intervals throughout the day.
▪ There will be a 20-minute interval between acts one and two.
at intervals 1 : with an amount of space in between
▪ There are signs at regular intervals along the outside wall. ▪ The chairs were placed at intervals of two feet. 2 : with an amount of time in between
▪ It recurs at (regular) intervals of every six months.
▪ There are signs at regular intervals along the outside wall. ▪ The chairs were placed at intervals of two feet.
▪ It recurs at (regular) intervals of every six months.
