Such that it can not be disregarded or omitted; vital; prerequisite; essential; needful; needed: as, environment is necessary to support pet life; food is essential to nourish your body.
prerequisite for reasonable convenience and center or completeness in achieving the point meant: since, the land essential for creating a railroad.
Naturally and inseparably connected into the ordinary training course: as, essential consequences.
functioning from compulsion or even the absolute dedication of factors: opposed to no-cost. See no-cost.
Synonyms required, crucial, necessity, Needful. These remarks refer to the application of the words to ordinary practical matters, not to ever viewpoint. Necessary can be so basic a word it addresses all of the others, and contains the additional good sense, that they would not have, of inevitable. Essential is a complete word, noting what is a part of the main end for the activity, or of each and every mode of taking that end about. Requisite is less powerful than important, and needful is less powerful nevertheless; yet each is strong and emphatic, deciding on whatever is imperatively required. Needful typically applies to concrete, and often to short-term, things: since, knowledge of the countries seen is prerequisite, as well as essential, to enjoyment of travel, but cash is needful to become in a position to travel after all. Needful is oftentimes applied to what needs to be furnished to create or effect a fantastic condition or activity.