Definition

Classification

The method of creating words by removing the supposed suffixes, so called because many of the removed endings are not suffixes but inseparable parts of the words. 去掉所谓的后缀而产生新词的方法，这是因为许多被去掉的后缀不是真正的后缀，而是单词不可分割的部分。

The opposite process of suffixation.

Four types of backformation: Abstract nouns抽象名词; Agential nouns施事名词; Compound nouns and others复合名词和其他; Adjectives形容词

Features: Stylistically, back-formation words are largely informal and some of them have successfully gained currency.