Thayer's Greek Lexicon

 1. with one mind, with one accord, with one passion

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A unique Greek word, used 10 of its 12 New Testament occurrences in
the Book of Acts, helps us understand the uniqueness of the Christian
community. Homothumadon is a compound of two words meaning to "rush
along" and "in unison". The image is almost musical; a number of
notes are sounded which, while different, harmonise in pitch and
tone. As the instruments of a great concert under the direction of a
concert master, so the Holy Spirit blends together the lives of
members of Christ's church.