| Install before November, say | 28 |
| Install asphalt | 15 |
| Install as king | 15 |
| Install a sidewalk | 18 |
| Install a new lawn | 18 |
| Install a Minister | 18 |
| Install | 7 |
| Instagram uploads, informally | 29 |
| Instagram upload, informally | 28 |
| Instagram upload | 16 |
| Instagram shot | 14 |
| Instagram posting | 17 |
| Instagram post | 14 |
| Instagram page, essentially | 27 |
| Instagram filter | 16 |
| Instagram effect, sometimes | 27 |
| Instagram effect | 16 |
| Instagram content | 17 |
| Instagram and Fruit Ninja, e.g. | 31 |
| Instagram account creator | 25 |
| Instability of stereotypical BMW drivers? | 41 |
| Instability | 11 |
| Insta- relative | 15 |
| Inst. whose library is named after Adm. Nimitz | 46 |
| Inst. that writes the GRE and the TOEFL | 39 |
| Inst. that turns out lieutenants | 32 |
| Inst. that includes C.W. Post | 29 |
| Inst. replay feature | 20 |
| Inst. replay effect | 19 |
| Inst. on the Hudson | 19 |
| Inst. of the Fighting Engineers | 31 |
| Inst. of learning | 17 |
| Inst. of higher learning | 24 |
| Inst. of higher education | 25 |
| Inst. near Olean, N.Y. | 22 |
| Inst. near Harvard | 18 |
| Inst. like Swarthmore | 21 |
| Inst. like Northeastern | 23 |
| Inst. in Troy, N.Y. | 19 |
| Inst. in the smallest state | 27 |
| Inst. in the Ocean State | 24 |
| Inst. in Nashville | 18 |
| Inst. in N.Y. | 13 |
| Inst. in Montgomery, Ala. | 25 |
| Inst. in Henderson, Tenn. | 25 |
| Inst. in Cambridge | 18 |
| Inst. in Athens | 15 |
| Inst. founded by Thomas Jefferson | 33 |
| Inst. founded by Jefferson | 26 |
| Inst. founded by a famed televangelist | 38 |
| Inst. for Tiny Tim | 18 |
| Inst. for midshipmen | 20 |
| Inst. flight rules | 18 |
| Inst. attended by Abdul-Jabbar | 30 |
| Inst. at Troy, N.Y. | 19 |
| Inst. at Tempe | 14 |
| Inst. at Savannah | 17 |
| Inst. at Sandhurst | 18 |
| Inst. at Philadelphia | 21 |
| Inst. at Ogden, Utah | 20 |
| Inst. at Nashville | 18 |
| Inst. at Lubbock, Tex. | 22 |
| Inst. at Lexington, Va. | 23 |
| Inst. at Hanover, N.H. | 22 |
| Inst. at Fort Worth | 19 |
| Inst. at Dallas | 15 |
| Inst. at Columbus | 17 |
| Inst. at Charlottesville | 24 |
| Inst. at Baton Rouge | 20 |
| Inst. at Annapolis | 18 |
| Inst. at Ames | 13 |
| Inst. 100 years old | 19 |
| Inst. | 5 |
| Inspiron manufacturer | 21 |
| Inspiron maker | 14 |
| Inspirits, with "up" | 30 |
| Inspirited | 10 |
| Inspirit | 8 |
| Inspiring word | 14 |
| Inspiring veneration | 20 |
| Inspiring talk: Abbr. | 21 |
| Inspiring sound | 15 |
| Inspiring sisters | 17 |
| Inspiring shivers | 17 |
| Inspiring romance, maybe | 24 |
| Inspiring prayers to Saint Jude, perhaps | 40 |
| Inspiring msg. | 14 |
| Inspiring lesson, perhaps: Abbr. | 32 |
| Inspiring leader | 16 |
| Inspiring jitters | 17 |
| Inspiring intro? | 16 |
| Inspiring intense fear | 22 |
| Inspiring instructor | 20 |
| Inspiring inexplicable fear | 27 |
| Inspiring horror | 16 |
| Inspiring fear | 14 |
| Inspiring disgust, say | 22 |
| Inspiring devices? | 18 |
| Inspiring dely. | 15 |
| Inspiring city for Van Gogh | 27 |