This is simply how Americans spell **vigour**. Same word, same meaning, same sound — only the letter u is dropped. It means strong healthy energy: the energy of a body that is working well, or the energy a person puts into doing something.

This is simply這其實只是 how Americans spell vigour美國人拼vigour的方式。Same word, same meaning, same sound一樣的字、一樣的意思、一樣的發音——only the letter u is dropped只是少了個字母u。It means strong healthy energy意思是強健的活力：the energy of a body that is working well身體運作良好時的那種能量，or the energy a person puts into doing something或一個人投入做事的那種幹勁。

You can say a plant grows with vigor, an old man is still full of vigor, or someone shakes your hand with vigor. It is a slightly formal, written-feeling word; in daily speech people are more likely to say energy or strength.

You can say你可以說 a plant grows with vigor植物長得很有活力，an old man is still full of vigor老人依然精神奕奕，or someone shakes your hand with vigor或有人用力地跟你握手。It is a slightly formal, written-feeling word這是個稍微正式、偏書面的字；in daily speech people are more likely to say energy or strength日常口語比較常說energy或strength。

American books, newspapers and websites use vigor; British ones use vigour. Australia, New Zealand and Ireland follow the British side. Both are correct — the only mistake is mixing the two spellings in one piece of writing.

American books, newspapers and websites use vigor美國的書、報紙、網站用vigor；British ones use vigour英國的用vigour。Australia, New Zealand and Ireland follow the British side澳洲、紐西蘭和愛爾蘭跟英式那邊。Both are correct兩種拼法都對——the only mistake is mixing the two spellings in one piece of writing唯一的錯是在同一篇文章裡混用兩種拼法。

Note that the adjective loses the u on BOTH sides of the ocean: vigorous, vigorously, never vigourous.

Note注意 that the adjective loses the u on BOTH sides of the ocean形容詞在兩邊都會把u拿掉：vigorous, vigorously是vigorous、vigorously，never vigourous絕不會是vigourous。