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

The two-way zipper is also a nice touch, allowing for optimal flexibility and freedom of movement for winter hiking or a trip outside in near-freezing weather. —Julia Morlino, Travel + Leisure, 5 Dec. 2025

The hem skims the ankles, offering optimal length for this time of year. —Nicol Natale, PEOPLE, 5 Dec. 2025

The cells’ invasiveness—critical for securing nutrients and ensuring optimal fetal growth—was impaired. —Daniella Gray, MSNBC Newsweek, 5 Dec. 2025

For optimal absorption and health benefits, take turmeric supplements with meals, especially those containing fats. —Heidi Moawad, Verywell Health, 4 Dec. 2025

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