1. the most favorable or advantageous condition or amount

1. most favorable or advantageous; best

Examples

• The optimum temperature for plant growth is 75 degrees.
• We need to find the optimum solution to this problem.
• The machine operates at optimum efficiency when properly maintained.
• Scientists are searching for the optimum conditions for the experiment.
• The optimum time to plant tomatoes is after the last frost.
• Her performance reached its optimum during the championship game.