1. by the way; incidentally
ときに、主人を見かけなかったでしょうか?By the way, you haven't seen my husband, have you?
2. sometimes; occasionally; on occasion
優しい母も、ときに厳しいことを言う。Even my gentle mother says harsh things at times.
3. precisely (at that time); exactly; just (then); right (then)