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. 2012