appearance, entrance, revealing

to appear, to reveal

atomicity

crude oil

(grammar) a Japanese or Korean word that does not inflect and can be used as a grammatical subject

electric power source, power supply / power outlet, power socket

The original, untranslated version of a text. / A foreign book written in a foreign language, especially from Europe or America.

string instrument, stringed instrument

(pathology, immunology) pathogen

lovers' quarrel