valid

• adj.有効である；根拠がある；合法である；正当である

ラテン語のvalere（強い、勇敢な）が語源で、語源的にはvalue（価値）と同じ。

valid

valid: [16] Something that is valid is etymologically ‘strong’, and hence ‘effective’. The word comes via French valide from Latin validus ‘strong, effective’, which was derived from the verb valēre ‘be strong’ (source also of English valiant, valour, value, etc). The negative form invalid [16] also goes back to Latin, but its specific application to infirm people, differentiated with a distinct pronunciation, was introduced from French in the 17th century.
=> valiant, valour, value

valid (adj.)

1570s, "having force in law, legally binding," from Middle French valide (16c.), from Latin validus "strong, effective, powerful, active," from valere "be strong" (see valiant). The meaning "sufficiently supported by facts or authority, well-grounded" is first recorded 1640s.

1. For foreign holidays you will need a valid passport.

出国には有効なパスポートが必要です。

2.He recognized the valid points that both sides were making.

彼は双方の観点の中の合理的な点を認めた。

3.All tickets are valid for two months.

すべてのチケットは2ヶ月以内に有効です。

4.He did not accept this reply as valid .

彼はこの回答に根拠がないと考えている。

5.a bus pass valid for 1 month

バス定期券