Optimality

n.capable, thoughtfulprofessional

What it means

The state of being the best possible choice.

Reach for it when naming the state of being best under stated goals and constraints

Engineers confirmed the design's optimality under the stated constraints.

everyday
best fit
practical suitability matters more than mathematical proof
not when Best fit can be approximate.
professional
efficiency
resource use relative to output is the objective
not when An optimum can target quality rather than efficiency.
professional
optimal status
a transparent expanded phrase aids clarity
not when Status needs the objective and constraints named.
formal
fitness
suitability to a purpose is the key measure
not when Fitness need not identify the best available option.
formal
ideality
closeness to an imagined ideal is central
not when An ideal may ignore real constraints.

prove optimality
The search procedure could not prove optimality within the time limit.
conditions for optimality
The paper states the conditions for optimality before presenting results.
global optimality
Global optimality matters less when the inputs remain uncertain.

Optimality is always relative to an objective, model, and constraints; without them, best is undefined.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.