optimal

adjective

op·​ti·​mal ˈäp-tə-məl 

: most desirable or satisfactory : optimum

the optimal use of class time

the optimal dosage of medication for a patient

conditions for optimal development

optimality

ˌäp-tə-ˈma-lə-tē 

noun

optimally

ˈäp-tə-mə-lē 

adverb

Examples of optimal in a Sentence

He keeps his engine tuned for optimal performance.

Under optimal conditions, these plants grow quite tall.

Recent Examples on the Web

Staying hydrated, after all, is necessary for optimal brain function and energy. — Kirsten Nunez, Martha Stewart, 8 Aug. 2026

By then, growth will be optimal, and the helipad work should be complete, making the lawn restoration easier. — ABC News, 7 Aug. 2026

One such location, Stellafane Observatory in Springfield, Vermont, is recognized worldwide as a site with optimal conditions for observing the night sky. — Michael J. Caduto, Hartford Courant, 7 Aug. 2026

Offering optimal freedom of movement and endless styling, the Lomon Wide-leg Capri Pants instantly elevate any outfit while keeping you cool and comfortable on scorching travel days when any other bottoms start to cling. — Julia Morlino, Travel + Leisure, 7 Aug. 2026

Word History

Etymology

optim(um) + -al entry 1

First Known Use

1890, in the meaning defined above

Phrases Containing optimal

• sub-optimal

Kids Definition

optimal

adjective

op·​ti·​mal ˈäp-tə-məl 

: optimum entry 2

optimally

-mə-lē 

adverb

Medical Definition

optimal

adjective

op·​ti·​mal ˈäp-tə-məl 

: most desirable or satisfactory : optimum

optimal concentrations of a drug

optimality

ˌäp-tə-ˈmal-ət-ē 

noun

plural optimalities

optimally

-mə-lē 

adverb