to fasten or stick one thing to another

affix something to something She affixed a stamp to the envelope. 她把一张邮票贴在信封上。

a letter or group of letters added to the beginning or end of a word to make a new word

The affixes un- and -less are often used to make negative words, such as "unhappy" and "careless". 词缀 un- 和 -less 常用来构成表示否定意义的词，如单词 unhappy 和 careless。