1. a person who gives lectures, especially as a job at a university or college
2. a person who gives a formal talk to an audience on a particular subject

Examples

• The lecturer explained the theory clearly to the students.
• She works as a lecturer in the history department.
• The guest lecturer spoke about climate change.
• Students gathered in the hall to hear the visiting lecturer.
• He became a lecturer after completing his PhD.
• The lecturer used slides to illustrate her points.
• Many lecturers also conduct research at the university.