The word for "fourth" in English is "fourth." This ordinal number is used to denote the position of an item in a sequence. For example, if you have a list of items, the fourth item would be the one that comes after the first, second, and third.

In mathematical contexts, "fourth" can also refer to division into four equal parts or fractions. For instance, one-fourth is represented as 1/4 or 0.25.

The concept of "fourth" extends beyond simple counting and fractions. In music, for example, a fourth is an interval between two notes that are four steps apart on a musical scale. In literature and storytelling, the fourth wall refers to the imaginary barrier between characters in a play and the audience.

In sports, particularly in relay races or similar team events, there might be a fourth runner who completes the final leg of the race. In chess, each player has four pawns at the start of the game.

Understanding and using "fourth" correctly can enhance communication in various fields, from mathematics and science to arts and sports.