ESSENTIAL

[adjective] - necessary; neededGovernment support will be essential if the project is to succeed.Only the ambassador and five essential staff will remain in the embassy.There is essential work to be done before the building can be re-occupied.Maintaining standards is essential to our good reputation.Water is essential for/to living things.It is essential (that) our prices remain competitive.For the experiment to be valid, it is essential to record the data accurately.Cooperation is an essential element/ingredient in any marriage.Some theorists would say that exams are not an essential part of education.An essential oil is an oil, usually with a strong smell, which is taken from a plant and is used to make perfume, or for rubbing into a person's body during massage.Lavender, peppermint, and jasmine are essential oils which are widely available.Essential oils are used in aromatherapy to improve physical and mental well-being.Essential services are basic public needs, such as water, gas and electricity, which are often supplied to people's houses.