| VERST | Russian unit of length equal to approximately two-thirds of a mile |
| METRE | Unit of length equal to approximately 1.094 yards (5) |
| ELL | An obsolete unit of length equal to approximately 45 inches |
| ELLS | Former units of length, equal to approximately 45 inches (4) |
| CIRCA | Approximately two-thirds of Ring before finish of opera |
| RIGHT | What approximately two thirds of people drive on (5) |
| JOULE | SI unit of work or energy equal to the work done by a force of one newton acting through one metre. It is also equal to approximately 0.7377 foot-pounds. (5) |
| MUTCHKIN | Scottish unit of liquid measure equal to approximately three-quarters of an imperial pint (8) |
| RIOJA | Port and two thirds of a glass of Spanish wine (5) |
| OREL | Russian city that's two-thirds of a threat |
| FOOL | What a sponge head: brought back two-thirds of a loofah! (4) |
| ELARA | Named after one of Zeus's lovers, a small moon of Jupiter, approximately two per cent of the size of Europa (5) |
| THERM | Unit of heat equal to approximately 105.5 megajoules, used especially to measure domestic gas supply (5) |
| ZETTABYTE | In computing, a unit of data storage equal to approximately 8,000,000,000,000,000,000,000 bits (9) |
| GALLON | Unit of capacity equal to approximately 4.55 litres (6) |
| TAEL | Unit of weight used in Asia equal to approximately 1.3 ounces (4) |
| LIGHT | ___ year; unit of distance equal to approximately 5.9 trillion miles (5) |
| KILOBAR | Unit of pressure equal to approximately 14,500 pounds per square inch or 100 megapascals (7) |
| LITRE | Metric unit of capacity equal to approximately 0.21 imperial gallons (5) |
| MILLIWATT | Unit of electrical power equal to approximately 0.000001341 horsepower (9) |
