necessary

英['nes?s(?)r?] 美['n?s?s?ri]

necessary 必要的，必需的

ne-,無，沒有，不能，詞源同no,-cess,走，離開，詞源同cede,concession.即不能走的，不能離開的，引申詞義必不可少的，必需的。

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.).

2. Now there is a dawning realisation that drastic action is necessary.: 現在人們開始意識到必須采取斷然的行動。

3. Fry remaining peppers, adding a little more dressing if necessary.: 用油炸一下剩下的辣椒，如果需要再加點調味汁。

5. We will use air power to protect UN peacekeepers if necessary.: 必要的話我們會動用空軍保護聯合國維和人員。