In my neighborhood in Pawtucket, it’s common to run into your neighbors on summer evenings. Lots of people eat dinner on their porches, or go for walks up and down the streets, or drink wine in the yard as the sun sets. My partner, Nate, and I like to walk. As we do, children bound up to us and begin to chatter excitedly. They may show us the praying mantis they caught in a jar, or the shells they collected on the beach that day, or give us the details about the birthday party down the street. We talk with their parents, talk about nothing in particular, nothing too important, but we laugh often. As the orange sun sets and the purple-grey twilight takes its place, it is comforting, fortifying conversation.
These simple, random interactions make me feel whole.
(Curt Columbus, The Importance of Neighbors)
I disagree with the OALD's tagging of the definition as "only before noun". English grammar has a number of general rules (such as putting adjectives before nouns) that are frequently ignored for stylistic or historical reasons ("attorney general").
In this case, whole does mean "complete", with the suggestion that this is the way things ought to be, even if they often aren't.