| aquatic engineering(noun, expression, study, treatment, science) |
| archaeological artifact(noun, expression, study, treatment, science) |
| architectural engineering(noun, expression, study, treatment, science) |
| archival bond(noun, expression, study, treatment, science) |
| area of space science(noun, expression, study, treatment, science) |
| army engineering maintenance(noun, expression, study, treatment, science) |
| artes mechanicae(noun, expression, study, treatment, science) |
| artificial intelligence(noun, expression, study, treatment, science) |
| artificial material(noun, expression, study, treatment, science) |
| artificial muscle(noun, expression, study, treatment, science) |
| aseptic processing(noun, expression, study, treatment, science) |
| aspartame-acesulfame salt(noun, expression, study, treatment, science) |
| astronomy astronomical object(noun, expression, study, treatment, science) |
| astrooceanography(noun, expression, study, treatment, science) |
| astrophysics(noun, study, treatment, science, knowledge) |
| athletic training(noun, expression, study, treatment, science) |
| atmospheric optics(noun, expression, study, treatment, science) |
| atomic clock ensemble in space(noun, expression, study, treatment, science) |
| atomic engineering(noun, expression, study, treatment, science) |
| atwater system(noun, expression, study, treatment, science) |