Optimal

adj.capable, hopefulprofessional

What it means

Most favorable for achieving a particular result under the stated conditions.

Reach for it when describing the best fit for a defined purpose, not perfection in every respect

The team chose the optimal route for safety, even though another route was shorter.

everyday
best
when simple language and a clear comparison are enough
not when Best is vague unless the reader already knows the goal and alternatives.
everyday
ideal
when imagining the most desirable situation without practical limits
not when Ideal can be unattainable, while optimal should follow the real constraints.
professional
fit-for-purpose
when adequacy for a defined use matters more than superiority
not when This means suitable enough, not necessarily optimal.
professional
most effective
when results are the only criterion
not when Effectiveness does not account for cost, comfort, or other tradeoffs.
professional
preferred
when policy or informed choice selects one option
not when A preference may reflect taste rather than objective performance.
formal
advantageous
when an option provides a relative benefit
not when An advantageous choice may still fall short of the strongest available one.
formal
favorable
when conditions support success without being demonstrably the best
not when It is weaker than optimal and should not imply a completed comparison.
literary
prime
when a place, time, or example is especially suitable
not when Prime sounds promotional when a measured optimum is intended.

optimal conditions
Seedlings reached the greenhouse only after the team established optimal conditions.
optimal balance
The schedule found an optimal balance between rehearsal time and rest.
optimal outcome
An optimal outcome protects the wetland while preserving safe public access.

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