Building Materials And Design

noun a musical instrument that produces sound without using electricity

adjective relating to sound or the sense of hearing

• The acoustic properties of the concert hall were carefully designed to enhance the sound quality.
• I love playing my acoustic guitar by the campfire.
• The acoustic set at the coffee shop was totally chill.
• Her acoustic performance really struck a chord with the audience.

noun a window or part of a window set on a hinge so that it opens like a door

• The architect designed the house with large casement windows to allow for plenty of natural light.
• I love opening up the casement windows in the morning to let in the fresh air.
• Don't forget to close the casement before you leave, we don't want any bugs getting in.
• The casement of opportunity opened for her when she least expected it.