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optimum or optimal?

Is there a difference between optimum and optimal?

As adjectives, they have the same meaning: best; most favourable; most conducive to a good result

They both come from the Latin optimus, meaning “best”.

Look at these examples:

  • What is the optimum/optimal childbearing age?
  • We need to find the optimal/optimum solution.
  • In our case, the optimum/optimal investment would produce a modest return at no risk.

Optimum can also be a noun, while optimal has two derivatives:

  • optimally (adverb)
  • optimality (noun)

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