Meaning of MUTUALLY in English

mu ‧ tu ‧ al ‧ ly AC /ˈmjuːtʃuəli/ BrE AmE adverb

[ Word Family: adverb : ↑ mutually ; adjective : ↑ mutual ]

1 . mutually acceptable/beneficial/convenient etc something that is mutually acceptable etc is acceptable etc to both or all the people involved:

We eventually arrived at a figure that was mutually acceptable.

2 . mutually exclusive two ideas or beliefs that are mutually exclusive cannot both exist or be true at the same time

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.