Prefixes, suffixes, and roots
Break unfamiliar words into meaningful parts while remembering that word history does not replace context.
Build from parts#
A prefix comes before a base: re- in rewrite suggests again. A suffix comes after: -er in writer forms a person noun. A root carries a central element of meaning across related words.
Common prefixes include un- (not or reverse), pre- (before), inter- (between), and sub- (under). Common suffixes include -ful, -less, -tion, and -ize.
Word families#
The forms act, action, active, activate, and react share a family, but their grammatical roles differ. Recognizing the family helps you predict both meaning and sentence position.
Roots as clues#
Roots from Greek and Latin appear in academic vocabulary. Bio relates to life; geo to earth; chron to time. These clues help with words such as biology, geography, and chronology.
Limits#
Words develop meanings that may not equal the simple sum of their parts. Understand does not mean “stand under.” Treat analysis as a clue, then test the whole word against the sentence and a reliable dictionary.
Practice#
When meeting an unfamiliar word, circle recognizable parts, propose a meaning, check the surrounding sentence, and then confirm. Record the full word with its family rather than memorising the root alone.
Key points
- Prefixes usually appear before a base and modify meaning.
- Suffixes can change meaning, grammatical role, or both.
- Roots connect related words across a word family.
- Word-part clues produce a hypothesis that context must confirm.