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| English thesaurus | |||
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| angstrom unit (Vosoni); arbitrary units; atomic unit | |||
| arithmetical unit | |||
| each ear (лат. auris utro) | |||
| arbitrary unit (произвольная единица semfromshire) | |||
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| absorbance unit; arbitrary unit; astronomical unit | |||
| Alma Urbs ("beloved city", Rome) | |||
| antitoxic unit; Angstrom Unit | |||
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| Allen and Unwin | |||
| above and under | |||
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| above and under | |||
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| attached/unassigned | |||
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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 |