by the way; in this connection; incidentally; in passing
ちなみに、私は猫が好きです。
By the way, I like cats.
ちなみに、明日は雨が降るそうです。
Incidentally, it's supposed to rain tomorrow.
ちなみに、この店は安くて美味しいよ。
By the way, this restaurant is cheap and delicious.