interjection
yes; that's correct
A casual, sometimes abrupt affirmative response, often used in informal settings. Can sound blunt compared to はい.
See also: はい
「これ、君の?」「え。」
"Is this yours?" "Yeah."
「明日までに終わる?」「え、大丈夫。」
"Can you finish by tomorrow?" "Yeah, no problem."
particle
sentence-ending particle for emphasis
Archaic particle used at the end of a sentence to strengthen a question or assertion. Found in classical Japanese and older literary works.
「行くえ」と言えば、古風な強調になる。
Adding え to '行く' makes it an old-fashioned emphatic form.
particle
Archaic particle used after a noun or similar when calling out to someone, similar to 'hey' or 'oh'. Not used in modern speech.
古語では「君え」と呼びかけることがある。
In classical language, one might call out '君え' to address someone.