The word odd has several related meanings:

When something is odd, it seems strange, unusual, or unexpected. If your normally cheerful friend seems quiet and distant, you might think their behavior is odd. Finding a penguin in your backyard would definitely be odd. The word suggests something doesn't quite fit the normal pattern: an odd noise in the attic, an odd taste in your soup, or an odd feeling you can't quite explain.

In mathematics, odd numbers are whole numbers that can't be divided evenly by two: 1, 3, 5, 7, 9, and so on. When you divide an odd number by two, you always get a remainder of one. Even numbers (2, 4, 6, 8) are their opposites. This meaning connects to the “unusual” sense: odd numbers stand apart from even numbers in the same way odd situations stand apart from normal ones.

The word also describes something that doesn't match or complete a set. An odd sock is one whose partner got lost in the laundry. You might have an odd glove left over after winter. Odd jobs are small tasks that don't fit into any regular category, like raking leaves one day and painting a fence the next.