a person with special knowledge, skill, or training in something a computer/medical expert expert (at/in/on something) an expert in child psychology an expert on modern literature expert (at/in/on doing something) He's an expert at getting his own way. Don't ask me—I'm no expert!
Want to learn more?
Find out which words work together and produce more natural sounding English with the Oxford Collocations Dictionary app.
Check pronunciation: expert