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necessary

1 necessary /ˈnɛsəˌseri/ Brit /ˈnɛsəsri/ adjective
1 necessary
/ˈnɛsəˌseri/ Brit /ˈnɛsəsri/
adjective
Britannica Dictionary definition of NECESSARY
[more necessary; most necessary] : so important that you must do it or have it : absolutely needed
always used before a noun, formal : unable to be changed or avoided

necessary evil

see 2evil
2 necessary /ˈnɛsəˌseri/ Brit /ˈnɛsəsri/ noun
plural necessaries
2 necessary
/ˈnɛsəˌseri/ Brit /ˈnɛsəsri/
noun
plural necessaries
Britannica Dictionary definition of NECESSARY
necessaries [plural] : things (such as food, a place to live, and clothing) that you must have : necessary things
the necessary British, informal : whatever is needed for some purpose