›very important or necessary: Computer literacy is becoming as essential as the ability to drive a car.an essential component/part of sthSelective expansion of our store base is an essential component of our long-term plan.essential for sthFormulating new strategies is essential for preparing the corporation to meet and sustain future needs.it is essential (that)It is essential our prices remain competitive.it is essential to do sthIt is essential to research and protect your patent.essential to sthKnowledge, skills, and creativity are essential to creating high-value products.