| GOOGOLPLEX | Large number defined by American mathematician Edward Kasner's nine-year-old nephew Milton Sirotta as "one, followed by writing zeroes until you get tired" |
| CHAOS | "When the present determines the future, but the approximate present does not approximately determine the future," per the mathematician Edward Lorenz |
| NASH | John Forbes ___, American mathematician played by Russell Crowe in the film A Beautiful Mind |
| GAUSS | Something enjoyable engaging American mathematician |
| ABEAUTIFULMIND | Film about American mathematician (1,9,4) |
| BIFF | Sound of a punch [E] {I created this puzzle for Take Your Kids To Work Day in collaboration with my then-nine-year-old twins. Clues followed by an [S] were written by Sid, and clues followed by an [E] |
| DOROTHYGALE | Nine-year-old Sharon Weron was compared to this film character when she survived a 1.25-mile trip in a 1955 South Dakota tornado |
| HEYARNOLD | Nickelodeon cartoon with a nine-year-old title character |
| DOLLYPARTON | In 2019, this country legend pulled a 9-year-old singer from the path of an oncoming car on the set of a Netflix movie |
| WILLIAM | 1st Earl of Pembroke; regent of the nine-year-old Henry III (7,7) |
| MARSHAL | William, regent of England for the nine-year-old Henry III (7) |
| TUT | Famous nine-year-old king |
| PIPPI | Nine-year-old on Swedish kronor |
| UNCLE | In Tati's 1958 award-winning film. and his first in colour. M. Hulot is what relation to nine-year-old Gerard Arpel? (5) |
| PAPERMOON | Movie with a 9-year-old Best Supporting Actress winner |
| PAPER | Movie with a 9-year-old Best Supporting Actress winner |
| ALEC | Author Greven who wrote the bestselling book "How to Talk to Girls" when he was nine years old |
| FIRESTARTER | 1984 Stephen King movie starring 9-year-old Drew Barrymore |
| TYRABANKS | Supermodel who revealed on "Today with Jenna & Friends" this week that she recently moved out of the country with her 9-year-old son and her husband" |
| NOSAMYRREP | Loser of only three cases in a nine-year TV run |
