Looking up this on English exchange I couldn't seem to find a single source of truth:

Instance 1 - "Prerequisite" in search: "Prerequisite for" vs. "prerequisite to"

Instance 2 - "Pre-requisite" in search: Single word for "This task cannot proceed until these other tasks are completed first"?

I suppose it's a bit of a broader question:

Words seem to have "pre-" prepended to indicate action or applicability before something. However these same words also have a fully-qualified English word which appears to meet the same function.

E.g. "pre-condition & precondition", "pre-requisite & prerequisite".

When do we use one or the other? Is the "pre-" variant always incorrect usage when a fully qualified word exists?

Apologies for any of my own grammatical errors in posting. Possibly the most self-conscious forum for posting questions in!

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