To get involved in a situation where one is not wanted or needed, often with the intention of helping but causing more harm. She didn't want her parents to interfere in her personal life.
To prevent a process or activity from continuing or being carried out properly. The loud noise from the construction site interfered with my ability to concentrate on my work.
To handle or adjust something without permission, often causing damage or disruption. Please do not interfere with the equipment; it is very sensitive.
Of light, sound, or other waves, to combine so that the resulting amplitude is increased (constructive) or decreased (destructive). When the two laser beams meet, they interfere, creating a pattern of bright and dark fringes.