optimum

American  

[op-tuh-muhm] / ˈɒp tə məm /

noun

optima, plural optimums plural

1. the best or most favorable point, degree, amount, etc., as of temperature, light, and moisture for the growth or reproduction of an organism.

2. the greatest degree or best result obtained or obtainable under specific conditions.

---

adjective

1. most favorable or desirable; best.

   optimum conditions.

   Synonyms:

   optimal, perfect, ideal

optimum British  

/ ˈɒptɪməm /

noun

1. a condition, degree, amount or compromise that produces the best possible result

---

adjective

1. most favourable or advantageous; best

   optimum conditions

Other Word Forms

Noun Inflected Forms

• optima
  plural
• optimums
  plural

Etymology

Origin of optimum

First recorded in 1875–80; from Latin: noun use of neuter of optimus “best,” superlative of bonus “good”

Compare meaning

How does optimum compare to similar and commonly confused words? Explore the most common comparisons:

• optimum vs. optimal

Explanation

An optimum is the best condition or highest extent of something. He didn't mean to create a science experiment, but the unwashed coffee cup under his desk became the optimum dark, wet environment for growing lots of mold. Optimum came into English in the 19th century from the Latin optimus, "best." You can use optimum to describe the best conditions for meeting a goal or achieving something, and it often refers to conditions in scientific tests. Runners determine their optimum weight before running a marathon, and astronauts train in the optimum environments for recreating what they'll experience in space. Optimum conditions for a great barbecue might include sunshine and blue skies.

Example Sentences

McLaren are still struggling, Stella added, to get the best out of the Mercedes engine in terms of understanding how to operate it for optimum performance.

From BBC • Jul. 4, 2026

The companies said it would be possible to move the vehicle to series production for rapid deployment at optimum cost by combining the industrial strengths of the two companies.

From The Wall Street Journal • Jun. 15, 2026

But would it be an optimum use of their respective talents?

From Los Angeles Times • May 12, 2026

Compromised by too-cold tyres and a battery 10% down on the optimum charge as he went into the lap, Russell still beat Hamilton by 0.129secs while falling short of Antonelli by 0.22secs.

From BBC • Mar. 14, 2026

“The optimum population,” said Mustapha Mond, “is modelled on the iceberg—eight-ninths below the water line, one-ninth above.”

From "Brave New World" by Aldous Huxley