olemus
(a) esitus mitmes keeles, näiteks juhendi mitmekeelsus
= presentation in several languages, for example multilingualism of the guide

(b) mitme keele valdamine, st isiku mitmekeelsus
Wiktionary:
the condition of being multilingual; the ability to speak multiple languages

ülevaateid
https://www.linguisticsociety.org/resource/multilingualism

https://en.wikipedia.org/wiki/Multilingualism

http://www.blackwellpublishing.com/content/BPL_Images/Content_store/WWW_Content/9780631204978/21.pdf

https://www.unjiu.org/sites/www.unjiu.org/files/jiu_rep_2020_6_english.pdf

https://u-pad.unimc.it/retrieve/handle/11393/40435/804/HandBookCompleteLight.pdf

vt ka
- mitmekeelestus