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What to call a trait that has current utility but unclear evolutionary origin?

I'm looking for a commonly used term to describe a trait that has clear current utility but an evolutionary origin that is uncertain and that we do not necessarily wish to emphasize in our description (e.g. to avoid unnecessary speculation):

  • Adaptation emphasizes an origin driven by natural selection.
  • Exaptation emphasizes an origin driven by co-option.
  • "Aptation" fits the bill, but it seems cryptic and rarely used.

Thank you for your help.

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