Definitions

1. noun

one more than three in numbering or position

“The fourth floor of the building is the highest.”

2. adjective

coming next after three in a series, order, or time

“The fourth season of the show was released in December.”

3. adverb

to the fourth position or degree

“The team played their fourth game of the week in a row.”

4. verb

to place or put (something) in the fourth position

“She fourthed the books on the shelf.”