Murmur/ˈmɜːrmər/ Definition 1 of 4Pro Tip 1/2Quiet Conversation Used when people speak in hushed tones, where the content is not the focus. In the library, there's a constant murmur of students studying. Pro Tip 2/2Background Noise Describes sounds that are not loud enough to be clearly heard. During the meeting, a murmur filled the room as attendees discussed the presentation.