spacing

nouns

the time between occurrences of a repeating event
"some women do not control the spacing of their children"
spacing
is a type of (narrower)
a magnitude or frequency relative to a time unit
"they traveled at a rate of 55 miles per hour"; "the rate of change was faster than expected"
rate
the property possessed by an array of things that have space between them
spacing, spatial arrangement
is derived from
space