expression
Expresses doing something together with someone/something, or two things happening at the same time. Also used in the pattern 'A とともに B' to mean 'as A changes, B changes' or 'along with A, B'.
家族とともに新年を祝った。
I celebrated the New Year together with my family.
年を取るとともに、体力が落ちてきた。
As I've gotten older, my physical strength has declined.