1. Things that have been disposed of or thrown away and which are lying on the ground in a public place: Rosetta had difficulty in understanding why people toss so much litter onto the streets.
2. Dry material which is spread in a container and used as a toilet by animals; such as cats, while they are in people's homes: The father placed litter in his tabby's litter box, and since the family also had a rabbit in their home, they also used litter in its cage.
3. A group of young animals that are born together: Kevin's dog had a litter of cute puppies yesterday, but not quite as cute as the litter of kittens that were born last month.
4. The uppermost layer of the forest floor consisting chiefly of fallen leaves and other decaying organic matter: During Jane's walk in the nearby woods in the fall, she shuffled her feet through the litter of newly fallen foliage from the trees.

1. To cover a surface with many things in an untidy way: He was aware that he had a tendency to litter his desk with notes, books, and other items that should be organized and arranged for easier access.
2. To cover, clutter or to add many things or ideas in an untidy way to a place or to thoughts: Too many vulgar words litter his vocabulary whenever he talks.
3. To throw or to leave trash on the ground in a public place: It is illegal to litter the streets and some people have to pay a fine for littering when they are caught by the right city officials.

As usual, people will no doubt litter the streets with paper cups, food wrappings, and other kinds of litter during the parade on Monday.