1
[ adjective ] necessary for relief or supply

Examples

"provided them with all things needful"

Used in print

(Nathan Rapport, ""I've Been Here before!"...)

As retinal images are conceded to be an integral function of the brain it seems logical to suppose that the nerves , between the inner brain and the eyes , carry the direct drive for cooperation from the various brain centers - rather_than to theorize on the transmission of an image which is already in required location .

(Raymond C. Binder et al., editors, Proceedings...)

This tube could be adjusted in its axial direction by an electric drive to establish the required electrode spacing .

(Francis J. Johnston and John E. Willard, "The...)

The required amount of carbon_tetrachloride was distilled into a series of reaction cells on a manifold on a vacuum line .

(Clifford H. Pope, The Giant Snakes....)

about three years are required , there being a possible slight difference between males and females in the time required .

(Richard F. McLaughlin, et al., "A study of the...)

Theoretically , they are capable of extracting their required oxygen either from the surrounding air ( Ghoreyeb and Karsner , ' 13 ) or from pulmonary arterial blood ( Comroe , ' 58 ) .

Related terms

necessary

2
[ adjective ] required by rule

Examples

"in most schools physical education are compulsory" "attendance is mandatory" "required reading"

Used in print

(James Bryant Conant, Slums and Suburbs...)

First_and_foremost , vocational courses should not replace courses which are essential parts of the required academic_program for graduation .

Related terms

obligatory

3
[ adjective ] required or ordered to

Synonyms

called_upon

Examples

"felt called upon to do his duty"

Used in print

(Your Federal Income Tax. 1962 Edition (Revised to...)

His income is not required to be included in the return of his parent .

Related terms

obligated

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