| Union-vote facilitator | 22 |
| Unionize, so to speak? | 22 |
| Unique 1960's TV star | 25 |
| Unique identifier for dogs | 26 |
| Unique items or people | 22 |
| Unique object or person | 23 |
| Unique person or thing | 22 |
| Unique person, informally | 25 |
| Unique shades at the stable? | 28 |
| Unique stretch in time | 22 |
| Unique thing or person | 22 |
| Unisex cologne since 1994 | 25 |
| Unisex designer cologne | 23 |
| Unisex gown of old Greece | 25 |
| Unisex Shakespearean play? | 26 |
| Unisphere, essentially | 22 |
| Unit amount of sunlight seen? | 29 |
| Unit at the top of a browser | 28 |
| Unit by unit, in succession | 27 |
| Unit dosage of radiation | 24 |
| Unit equal to 10,000 gauss | 26 |
| Unit equal to 15.432 grains | 27 |
| Unit equal to 200 milligrams | 28 |
| Unit equaling 200 milligrams | 28 |
| Unit equaling 43,560 sq. ft. | 28 |
| Unit for a frequent flier | 25 |
| Unit for an electrician | 23 |
| Unit for Chris or Martina | 25 |
| Unit for dangerous situations | 29 |
| Unit for modern processors | 26 |
| Unit in a Brownian model | 24 |
| Unit in a geology book | 22 |
| Unit in a multiunit building | 28 |
| Unit in a physics textbook | 26 |
| Unit in a radar receiver | 24 |
| Unit in many a sentence | 23 |
| Unit in the c.g.s. system | 25 |
| Unit in una zona residencial | 28 |
| Unit indicated by " | 24 |
| Unit indicated by an omega | 26 |
| Unit indicating loudness | 24 |
| Unit measured by a gauge | 24 |
| Unit measuring loudness | 23 |
| Unit named for a physicist | 26 |
| Unit now called a siemens | 25 |
| Unit now known as a siemens | 27 |
| Unit of 1,000 kilograms | 23 |
| Unit of 100 ergs per gram | 25 |
| Unit of a flight of stairs | 26 |
| Unit of a huge explosion | 24 |
| Unit of a play's act | 24 |
| Unit of absorbed energy | 23 |
| Unit of academic credit | 23 |
| Unit of angular measure | 23 |
| Unit of angular measurement | 27 |
| Unit of Asian currency | 22 |
| Unit of assorted merchandise | 28 |
| Unit of bananas: Abbr. | 22 |
| Unit of breath freshening | 25 |
| Unit of Cambodian currency | 26 |
| Unit of capacity in England | 27 |
| Unit of chewing tobacco | 23 |
| Unit of Chinese currency | 24 |
| Unit of computer memory | 23 |
| Unit of computer storage | 24 |
| Unit of corporal punishment | 27 |
| Unit of cultural information | 28 |
| Unit of currency in Denmark | 27 |
| Unit of current, informally | 27 |
| Unit of data transmission | 25 |
| Unit of distance (not time) | 27 |
| Unit of eight computer bits | 27 |
| Unit of electric charge | 23 |
| Unit of electric current | 24 |
| Unit of electrical capacity | 27 |
| Unit of electrical charge | 25 |
| Unit of electrical current | 26 |
| Unit of electrical force | 24 |
| Unit of electrical potential | 28 |
| Unit of electrical power | 24 |
| Unit of electrical resistance | 29 |
| Unit of energy, in physics | 26 |
| Unit of explosive force | 23 |
| Unit of fineness for gold | 25 |
| Unit of fineness for silk | 25 |
| Unit of fuel use: Abbr. | 23 |
| Unit of heat, for short | 23 |
| Unit of indigestion relief | 26 |
| Unit of land measurement | 24 |
| Unit of length for Noah | 23 |
| Unit of light bulb intensity | 28 |
| Unit of light intensity | 23 |
| Unit of light-bulb intensity | 28 |
| Unit of luminous intensity | 26 |
| Unit of magnetic flux density | 29 |
| Unit of magnetic induction | 26 |
| Unit of magnetic inductivity | 28 |
| Unit of magnetic intensity | 26 |
| Unit of measure in a garage? | 28 |
| Unit of measure: Abbr. | 22 |