optimum
//ˈɒptɪməm//
Noun
optimumSingular
optimaPlural
1
The most favorable or advantageous condition, degree, or amount for a particular situation or purpose.
The researchers are trying to find the optimum for plant growth.
Adjective
optimumCanonical form
1
Most conducive to a favorable outcome; best or most effective.
The plants grow best under optimum conditions.