olemus
lingvistikas:
lause osa, mis annab uut, mittetuletatavat või vastandteavet

Wiktionary:
8. (linguistics) the most important word or phrase in a sentence or passage, or the one that imparts information

ülevaateid
https://en.wikipedia.org/wiki/Focus_(linguistics)

https://oxfordre.com/linguistics/view/10.1093/acrefore/9780199384655.001.0001/acrefore-9780199384655-e-207

http://gep.ruhosting.nl/carlos/matt.pdf

http://www.sfu.ca/~hedberg/gundel-fretheim.pdf

https://www.youtube.com/watch?v=xtuqXjKISY4