〜とともに
together with; as, along with
Noun / Verb dictionary form + とともに
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とともに is the formal "together with": 家族とともに新しい年を迎えた, "I welcomed the new year together with my family". In speech, と一緒に does this job.
It also links two changes, like につれて: 経済の発展とともに、生活が豊かになった, "as the economy developed, life became more prosperous". And it can mean "at the same time as": 春の訪れとともに, "with the arrival of spring".
In speeches and formal letters, it joins two feelings or actions: 感謝とともに、お祝いを申し上げます, "with thanks, I offer my congratulations".
It's often written 共に. Because it's formal, it's much more common in writing and the news than in conversation.
Examples
家族とともに、新しい年を迎えた。
I welcomed the new year together with my family.
年齢とともに、考え方も変わる。
Your way of thinking changes as you age.
経済の発展とともに、生活が豊かになった。
As the economy developed, life became more prosperous.
春の訪れとともに、花が咲き始めた。
With the arrival of spring, the flowers began to bloom.
感謝とともに、お祝いを申し上げます。
With thanks, I offer my congratulations.