necessary

• adj.必要な；要求される；避けられない
• n. Necessity
• n. （必要な）人名; （英）Necessary.

ne-、no、without、cannot、語源的にはnoと同じ、-cess、go、leave、語源的にはcede、concessionと同じ。すなわち、行くことができない、去ることができない、語源的には必須、必要。

necessary

necessary: [14] The original Latin adjective meaning ‘necessary’ was necesse (it was formed with the negative particle ne- from the stem of cēdere ‘yield’, source of English cede, and hence meant etymologically ‘unyielding’). This was subsequently extended to necessārius, and English acquired it via Anglo-Norman *necessarie.
=> cede, concede, proceed

necessary (adj.)

late 14c. "needed, required, essential, indispensable," from Old French necessaire "necessary, urgent, compelling" (13c.), and directly from Latin necessarius "unavoidable, indispensable, necessary," from necesse "unavoidable, indispensable," originally "no backing away," from ne- "not" + cedere "to withdraw, go away, yield" (see cede). The root sense is of that from which there is no evasion, that which is inevitable. Necessary house "privy" is from c. 1600. Necessary evil is from 1540s (the original reference was to "woman").

necessary (n.)

mid-14c., "needed, required, or useful things; the necessities of life; actions determined by right or law," perhaps from Old French necessaire (n.) "private parts, genitalia; lavatory," and directly from Latin necessarius (n.), in classical Latin "a relation, relative, kinsman; friend, client, patron;" see necessary (adj.).

1. For her,books were as necessary to life as bread.

彼女にとって本はパンのように生活必需品だ。

2.Now there is a dawning realisation that drastic action is necessary .

今、人々は断固たる行動を取らなければならないことに気づき始めている。

3.Fry remaining peppers,adding a little more dressing if necessary .

残りの唐辛子を油で揚げ、必要に応じてソースを加える。

4.It 's only necessary to use just a very small blob.

とても小さい一滴だけでいいです。

5.We will use air power to protect UN peacekeepers if necessary .

必要であれば、空軍を動員して国連平和維持要員を保護します。