Meaning & use
the prefix auto-
Last updated
Meanings
prefix
A prefix meaning 'self' or 'by itself', added to words like 'automatic' and 'autobiography'.
Grammar: Attaches to nouns and adjectives: auto- + biography = autobiography.
Patterns
- auto- + noun
- auto- + adjective
An autobiography is a book someone writes about their own life.
The door is automatic; it opens by itself when you approach.
prefix
A prefix meaning 'relating to cars or motor vehicles', as in 'automobile' and 'autobody'.
Grammar: Attaches to nouns related to cars: auto- + mobile = automobile.
Patterns
- auto- + noun
He works at an autobody shop repairing cars.
The automobile industry is important in many countries.
Common combinations
- automatic
- The automatic doors opened as we entered the store.
- autobiography
- She published her autobiography last year.
- automobile
- The automobile was invented in the late 19th century.
- autopilot
- The plane flew on autopilot for most of the journey.
Practice
What does the prefix 'auto-' mean in the word 'autopilot'?
Choose one answer.
In 'autopilot', 'auto-' means 'self' or 'by itself', referring to a system that operates without human control. The other options do not fit this meaning.
Make it your own
Write a sentence using “the prefix auto-”, then check it and compare it with the examples above.