expression, adverb
at the same time; simultaneously; concurrently
Used as an adverb to describe two or more actions or states occurring at the same time.
彼は仕事と勉強を同時に進めている。
He is pursuing his job and studies at the same time.
二人は
The two started speaking simultaneously.
expression, conjunction
just as ...; the moment ...; just after ...
Used as a conjunction in the pattern ～と同時に to mean that one action happens exactly when another does, or immediately after.
ドアを開けると同時に猫が飛び出した。
The moment I opened the door, the cat jumped out.
彼は卒業すると同時に結婚した。
He got married just after graduating.
expression, conjunction
at the same time (but); on the other hand; also
Used as a conjunction to introduce a contrasting or additional point, often with a nuance of 'while also' or 'but at the same time'.
この仕事はやりがいがあるが、同時にストレスも多い。
This job is rewarding, but at the same time it involves a lot of stress.
彼は優しい。同時に、とても厳しいところもある。
He is kind. At the same time, he can also be very strict.