Biology and medicine •
General anaesthesia, administration of drugs to induce unconsciousness prior to surgery •
Geographic atrophy, an advanced form of age-related macular degeneration •
Gestational age (obstetrics), in pregnancy, the time since onset of last menstrual period •
Embryonic age or gestational age, the length of gestation since fertilization •
Gibberellin, a plant growth hormone •
Tabun (nerve agent) (NATO designation GA)
Computing •
.ga, the country code top-level domain for Gabon •
General availability, the final stage in the software development lifecycle •
Genetic algorithm, an optimization technique in computer science •
Google Analytics, a web analytics service provided by Google
Other uses in science and technology •
Gallium (symbol Ga), a chemical element •
General aviation, the category of civil aviation encompassing all non-scheduled aircraft flights •
Geometric algebra, a Clifford algebra used in a geometric context •
Gigaampere (GA), an SI unit of electric current equal to 1,000,000,000 (one billion) amps •
Gigaannum (Ga), a unit of time equal to 1,000,000,000 (one billion) years. •
Globular Amphora culture, an archaeological culture in Europe • Go Ahead, in a
telecommunications device for the deaf • The
additive group scheme, denoted
Ga ==Sport==