Initialism of one-dimensional.

A selective service class denoting that the registrant is already a reserve member of the armed forces or a student taking military training, as in ROTC or an accepted aviation cadet applicant.

(medicine) Once per day, used for prescription directions.

A selective service class denoting that the registrant is only available for noncombat military service due to their conscientious objector status

A selective service class denoting that the registrant a conscientious objector available for alternate service contributing to maintenance of national health, safety, or interest.

plural of 1-H

(politics) A group of six world powers (China, France, Russia, the United Kingdom, and the United States, plus Germany) which joined the diplomatic efforts with Iran with regard to its nuclear program.

Abbreviation of New Delhi metallo-beta-lactamase-1 (“an enzyme conferring resistance to beta-lactam antibiotics”). / A bacterial gene that produces the enzyme.

(aviation) Initialism of jet propellant 1. (a highly refined kerosene; a type of jet fuel)

(astronautics) Initialism of rocket propellant 1. (a highly refined kerosene; usually used in combination with LOX)