What does "optimal" mean?

1. (best or most effective) the best or most effective possible in a particular situation. 2. (the best level) the best possible level or state that can be reached.

How do you use "optimal"?

This adjective is non-gradable; something is either optimal or it is not, so avoid saying 'more optimal'. Often used interchangeably with 'optimum' in technical contexts.

optimal

adj. · n.

US //ˈɑptəməɫ// UK //ˈɒptɪməl// op·ti·mal

1 best or most effective (adj.)
B2 Upper Intermediate Academic

the best or most effective possible in a particular situation.

the most favourable or desirable condition or outcome, especially when considering specific constraints or requirements.

Example

The plants need an optimal amount of sunlight and water to grow quickly.

Example

To achieve optimal performance, the engine must be maintained at a specific temperature range throughout the duration of the flight.

Usage

This adjective is non-gradable; something is either optimal or it is not, so avoid saying 'more optimal'.
- suboptimal
- worst
2 the best level (n.)
C1 Advanced Technical Academic Science

the best possible level or state that can be reached.

the best or most favourable degree, quantity, or condition for a particular result.

Example

The experiment reached its optimal after three hours of heating.

Example

The research team sought to identify the mathematical optimal for fuel efficiency across various atmospheric pressures.

Usage

Often used interchangeably with 'optimum' in technical contexts.
- optimum
- nadir

Origin

From Latin optimus + -al.