(transport) A three-lane road with two lanes in one direction and one lane in the other.

plural of 2+1 road

Alternative form of World War II

plural of number 2 pencil

A diet that stipulates calorie restriction for two non-consecutive days per week but allows unconstrained eating on the other five days.

Alternative spelling of Cold War II

(in sport) the achievement by a country of taking the first three positions in a race of competition.

(space flight) A lunar-resonant orbit about the Earth with a period of 1/2 that of the Moon's (P/2 is an orbit that is approximately a fortnight long)

plural of 5:2 diet

(virology) SARS-CoV-2; SARS-related coronavirus 2