2. Noun. (American football) In high school and NFL football, an arrangement of players on the field where fewer than seven players line up on the line of scrimmage. ¹
3. Noun. (American football) In NFL football, an arrangement of players on the field where eligible receivers fail to line up as the leftmost and rightmost players on the line of scrimmage. ¹
4. Noun. (American football) In NFL football, an arrangement of players on the field where five properly numbered ineligible players fail to line up on the line of scrimmage. ¹
5. Noun. (American football) In NCAA football, an arrangement of players on the field where or where more than four players are in the backfield. ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Illegal Formation
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