What it means
とも here is the combination of the case particle と and the additive particle も. It follows a noun or pronoun to mark an additional companion or partner, meaning “with X as well” or “together with X, too.” It is commonly used with actions such as discussing, cooperating, meeting, or sharing something. The も adds the sense that another person or group is also included.
Usage note
Do not confuse this use with noun + とも meaning “both” or “all,” as in 両親とも. In the present construction, とも means that the action is performed with the preceding person or group as an additional companion.
How to use it
私は研究仲間とも計画を検討しました。
I also reviewed the plan with my research colleagues.
私は研究仲間とも計画を検討した。
I also reviewed the plan with my research colleagues.
Example sentences
来週、姉とも新しいアパートを見に行く予定です。
Next week, I plan to go see a new apartment together with my older sister as well.
研究会では、海外の研究者とも意見を交換しました。
At the research meeting, I exchanged opinions with researchers from overseas as well.
卒業後の進路について、担任の先生