| Introductions cliché | 23 |
| Introductory appearances | 24 |
| Introductory bit (Var.) | 23 |
| Introductory course, often | 26 |
| Introductory discourse | 22 |
| Introductory drawing class | 26 |
| Introductory Greek letters | 26 |
| Introductory humanities class | 29 |
| Introductory language course | 28 |
| Introductory quotation | 22 |
| Introductory studio class | 25 |
| Introductory TV episode | 23 |
| Introductory words, maybe | 25 |
| Intros that come later | 22 |
| Introspective composition | 25 |
| Introspective question | 22 |
| Introvert musician, perhaps | 27 |
| Introvert or extrovert | 22 |
| Intrude, with "in" | 28 |
| Intruded, with "in" | 29 |
| Intruder-blocking software | 26 |
| Intruders in the pantry | 23 |
| Intrudes, with "in" | 29 |
| Intruding on the dance floor | 28 |
| Intrusive southern vine | 23 |
| Intuition, figuratively | 23 |
| Intuition, maybe: Abbr. | 23 |
| Intuition, so to speak | 22 |
| Intuitive college student? | 26 |
| Intuitive good judgment | 23 |
| Inuit in a 1922 film classic | 28 |
| Inuit transportation tool | 25 |
| Inuit's neighbour | 22 |
| Inuit, somewhat offensively | 27 |
| Inundate Liotta's bucket? | 29 |
| Invade in great numbers | 23 |
| Invaded, with "on" | 28 |
| Invader of Europe in 1241 | 25 |
| Invader of Rome in 390 B.C. | 27 |
| Invader of Spain: 8th century | 29 |
| Invader of the Roman Empire | 27 |
| Invaders conquered by Caesar | 28 |
| Invaders of Ancient Rome | 24 |
| Invaders of Kuwait, 1990 | 24 |
| Invalid befriended by Heidi | 27 |
| Invalidate in appeals court | 27 |
| Invalidate, as a check | 22 |
| Invalidate, as a marriage | 25 |
| Invalidated, as a contract | 26 |
| Invalidates, as a ticket | 24 |
| Invasion by a vice squad | 24 |
| Invasion craft (abbr.) | 22 |
| Invasion craft, briefly | 23 |
| Invasion group of 1964 | 22 |
| Invasion site of '42 | 24 |
| Invasive computer programs | 26 |
| Invasive crawling plant | 23 |
| Invasive Japanese import | 24 |
| Invasive Japanese vine | 22 |
| Invasive medical procedure | 26 |
| Invasive software, perhaps | 26 |
| Invent, as a word or phrase | 27 |
| Inventing "wizard" | 28 |
| Inventing, as an expression | 27 |
| Invention inspired by burs | 26 |
| Invention of 200's B.C. | 27 |
| Invention of Anders Celsius | 27 |
| Invention of Arthur Wynne | 25 |
| Invention of new words | 22 |
| Invention of the 1830's | 27 |
| Invention of World War I | 24 |
| Invention patented in 1858 | 26 |
| Invention's beginning | 25 |
| Invention's origin | 22 |
| Invention, so to speak | 22 |
| Inventions, so to speak | 23 |
| Inventive Swiss painter | 23 |
| Inventiveness of a sort | 23 |
| Inventor Elias and others | 25 |
| Inventor famed for plows | 24 |
| Inventor friend of Henry Ford | 29 |
| Inventor from Budapest | 22 |
| Inventor from Hartford | 22 |
| Inventor from Menlo Park | 24 |
| Inventor Jethro and namesakes | 29 |
| Inventor Linus: 1821-68 | 23 |
| Inventor Nikola et al. | 23 |
| Inventor Nikola and family | 26 |
| Inventor of a glass harmonica | 29 |
| Inventor of a rotatable cube | 28 |
| Inventor of a sign language | 27 |
| Inventor of a six-color fad | 27 |
| Inventor of a steam engine | 26 |
| Inventor of an instant camera | 29 |
| Inventor of basketball | 22 |
| Inventor of diving bell | 23 |
| Inventor of farm machines | 25 |
| Inventor of lawn tennis | 23 |
| Inventor of logarithms | 22 |
| Inventor of Menlo Park | 22 |