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
"The spacing between the trees on the hillside created a beautiful, open view."
The action of the verb space.
"The gardener adjusted the spacing between the tomato plants to ensure they had enough room to grow."
In plain English: Spacing is the empty area between things, like the gap you leave when arranging items on a shelf.
"The spacing between the letters on the page made the text much easier to read."
present participle of space
"The spacing between the trees made it difficult to see which was which."
In plain English: Spacing means to take breaks from doing something so you can rest your mind and body before starting again.
"The teacher asked the students to improve their handwriting spacing by leaving room between each letter."
That inserts space between two objects.
"The printer's spacing mechanism automatically inserted a blank line between each paragraph of text."
In plain English: Spacing means being spaced out, which is when you feel disconnected from reality and can't focus on what's happening around you.
"The spacing between the plants was wide enough for them to grow without competing for sunlight."