speaker
n. countable A2 Elementary Oxford US //ˈspikɝ// UK //spˈiːkɐ// speak·er
n. a person who is giving a talk or speech to a group of people. It also means the piece of equipment that sound comes out of on a phone, computer, or music system.
n. a person who delivers a speech or formal address to an audience. Also refers to an electroacoustic transducer that converts electrical signals into audible sound.
The speaker at the conference was very interesting.
I need to buy a new Bluetooth speaker because the sound on my laptop is too quiet.
While the keynote speaker addressed the assembly, technical staff worked frantically behind the scenes to repair a faulty speaker in the back of the hall.
Usage
When used as a title in politics (e.g., Speaker of the House), the word is typically capitalized.