| Math's highest degree? | 26 |
| Math power | 10 |
| Like a series finale? | 21 |
| Like a certain number | 21 |
| Last or greatest | 16 |
| Last of many a try | 18 |
| Last in line, usually | 21 |
| Last in a very long line | 24 |
| Last in a theoretical series | 28 |
| Last in a mathematical series | 29 |
| Last degree in math? | 20 |
| Kind of root in math | 20 |
| Kind of power, in math | 22 |
| Kind of power or degree | 23 |
| Inexact ordinal | 15 |
| Indeterminate ordinal | 21 |
| Indefinitely large degree | 25 |
| Indefinitely large | 18 |
| Indefinite power | 16 |
| Indefinite ordinal number | 25 |
| Indefinite ordinal | 18 |
| Highest ordinal number? | 23 |
| Highest degree? | 15 |
| Highest (degree) | 16 |
| Higher power? | 13 |
| High power | 10 |
| High math degree? | 17 |
| Greatest in an indefinitely large series | 40 |
| Final degree | 12 |
| Degree type | 11 |
| Degree preceder | 15 |
| Degree letters | 14 |
| Degree in algebra? | 18 |
| An impressive degree? | 21 |
| _____ degree | 12 |
| ____ degree | 11 |
| ___ root (math quantity) | 24 |
| Â Â Math ordinal | 22 |
| Highest degrees | 15 |
| Unspecified degrees | 19 |
| High degrees | 12 |
| Unnamed degrees | 15 |
| Ordinal extremes | 16 |
| Extreme degrees | 15 |
| Advanced degrees? | 17 |
| Utmost degrees | 14 |
| Unspecified fractions | 21 |
| Unspecified degrees, in math | 28 |
| Ordinals | 8 |
| Kinds of degrees | 16 |
| Some versions of Windows | 24 |
| Eves. | 5 |
| XP forerunners | 14 |
| Windows options | 15 |
| Theater ad abbr. | 16 |
| Some Windows OSes | 17 |
| Some Bible versions: abbr. | 26 |
| Relatives of afts. | 18 |
| PM times | 8 |
| Performance times: Abbr. | 24 |
| Opp. of days | 12 |
| Evenings: abbr. | 15 |
| Counterparts of afts. | 21 |
| Accident investigation agcy. | 28 |
| Fed. accident investigator | 26 |
| Crash-probing agcy. | 19 |
| Crash-investigating org. | 24 |
| Wreck-checking agcy. | 20 |
| U.S. accident investigator | 26 |
| Airline investigative org. | 26 |
| Govt. crash probers | 19 |
| Fed. travel monitor | 19 |
| Fed. crash investigator | 23 |
| Crash-investigating agcy. | 25 |
| Airplane accident investigator, initially | 41 |
| Airline accident investigator (Abbr.) | 37 |
| Agcy. that investigates crashes | 31 |
| Wreck-checking org. | 19 |
| US accident investigator | 24 |
| RR wreck checker | 16 |
| Pipeline accident investigator: Abbr. | 37 |
| Org. that monitors aircraft accidents | 37 |
| Org. that investigates crashes | 30 |
| It may delve into a derailment: Abbr. | 37 |
| Investigator of many accidents, for short | 41 |
| Govt. travel watchdog | 21 |
| Govt. investigative org. | 24 |
| Govt. crash investigator | 24 |
| Gov't. train wreck investigators | 36 |
| Federal org. with a "Safety Recommendations" Web page | 63 |
| Fed. wreck checker | 18 |
| Fed. crash site investigator | 28 |
| FAA ally | 8 |
| Crash-probing org. | 18 |
| Crash-probe org. | 16 |
| Crash site investigator: Abbr. | 30 |
| Crash investigators: Abbr. | 26 |
| Crash investigation org. | 24 |
| Black-box analyzers: Abbr. | 26 |
| Amtrak overseer: abbr. | 22 |