say it: SPAY-sing
spacing is a noun meaning "the time between occurrences of a repeating event". It carries 2 recorded senses.
the time between occurrences of a repeating event
“some women do not control the spacing of their children”
the property possessed by an array of things that have space between them
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for spacing come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.