'In vacuo' definitions:

Definition of 'in vacuo'

From: WordNet
adverb
In isolation and without reference to anything else
adverb
In a vacuum

Definition of 'In vacuo'

From: GCIDE
  • In vacuo \In` vac"u*o\ [L.] (Physics) In a vacuum; in empty space; as, experiments in vacuo. [1913 Webster]