interval

1 ENTRIES FOUND:
interval /ˈɪntɚvəl/ noun
plural intervals
interval
/ˈɪntɚvəl/
noun
plural intervals
Britannica Dictionary definition of INTERVAL
[count]
1 
: a period of time between events : pause
2 
music : the difference in pitch between two notes
3 
British : intermission

at intervals

1 
: with an amount of space in between
2 
: with an amount of time in between