| English thesaurus | |||
| |||
| angstrom unit (Vosoni); arbitrary units; atomic unit | |||
| arithmetical unit | |||
| each ear (лат. auris utro) | |||
| arbitrary unit (произвольная единица semfromshire) | |||
| |||
| absorbance unit; arbitrary unit; astronomical unit | |||
| Alma Urbs ("beloved city", Rome) | |||
| antitoxic unit; Angstrom Unit | |||
| |||
| Allen and Unwin | |||
| above and under | |||
| |||
| above and under | |||
| |||
| attached/unassigned | |||
|
a.u : 9 phrases in 7 subjects |
| Alternative dispute resolution | 1 |
| Astronomy | 2 |
| British usage, not spelling | 1 |
| Communications | 1 |
| Figurative | 1 |
| General | 2 |
| Optics branch of physics | 1 |