- A.U.
- angstrom unit.Also, a.u.
* * *
French. to the; in the; with the. It is a contraction of à le, masculine form of à la, occurring in some phrases frequently used in English, as au courant, au revoir.Au (no period),A.U. or a.u.,astronomical unit.A.U., A.u., a.u., Å.U. Å.u., or å.u.,angstrom unit.
Useful english dictionary. 2012.