adjective / noun

optimum

AHP-tih-muhm/ˈɑːptɪməm/

The best possible under particular conditions.

These plants need steady warmth and moisture for optimum growth.

Three potted plants under too little, suitable and excessive water, central plant healthy and strongest, no text.

Etymology

Latin optimus means “best.” English optimum was first used in biology for conditions most favorable to processes such as growth, giving “best” the practical sense of most favorable for a particular purpose.

In context

Balcony Garden Web2:40

This vine does best in the neutral pH range of 6.1 to 7. To ensure that it is getting the optimum range, getting a pH meter would be a great idea.

8 Top Tips on How to Grow Pothos Faster

More examples

For optimum results, let the dough rest before baking.
The optimum number of guests depends on the room's size.
The soil's moisture level is close to the optimum.

Forms

optimum · optima · optimums

optimal adjective — Most favorable under the given conditions.

optimize verb — To make as effective as possible.

Similar words

ideal: Suggests perfection, sometimes without regard to practical limits.
best: Broader term for the highest quality or greatest suitability.