Marain
Marain is a synthetic language created towards the very beginning of the Culture with the specific intention of providing a means of expression which would be a culturally inclusive and as encompassingly comprehensive in its technical and representational possibilities as practically achievable - a language, in short, that would appeal to poets, pedants, engineers and programmers alike. The intention was to start with a linguistic blank sheet, yet with the accumulated knowledge of the hundreds of thousands known to those people and machines charged with the language's devising. It had, therefore, no specific links to any of the main languages spoken by the people who came together to make up the Culture as a civilisation, save those statistically likely.
She spoke Marain, the language of The Culture.