unwanted echoes that interfere with the observation of signals on a radar screen
"The operator adjusted the gain to filter out the clutter caused by raindrops hitting the aircraft's wings, finally seeing the distant storm cell clearly."
A confused disordered jumble of things.
"The attic was filled with a clutter of old boxes, broken toys, and forgotten papers."
In plain English: Clutter is when there are too many unnecessary things piled up everywhere, making it hard to find what you need or relax.
"The messy desk was covered in clutter from last week's project."
fill a space in a disorderly way
"The child's toys cluttered the living room floor, making it impossible to walk through without tripping."
To fill something with clutter.
"The messy desk was filled with papers and pens that created a visual clutter of disarray."
In plain English: To clutter something means to fill it up with too many unnecessary items so there is no room left for anything else.
"Don't clutter your desk with unnecessary papers before you start working."
A surname.
"The Clutter family gathered at their home in Kansas to celebrate Thanksgiving."
The word clutter comes from Middle English cloteren, which originally meant "to form clots" or "to coagulate." It is derived from the root clot combined with a suffix that indicates repeated action, creating the sense of piling things up.