"mutual opening" is correct and can be used in written English.
It is typically used to describe a situation where two or more parties are simultaneously opening up or revealing information or thoughts to each other. Example: In their therapy session, the couple found that mutual opening and honest communication helped to strengthen their relationship.
However, the lack of mutual confidence hindered the opening of negotiations, leading to armed conflicts which evolved into a battle on 13 May.
Second, we use a concatenated channel approach to show that both TASK-2 arginine pHo sensors of this dimeric channel must be neutralized for channel opening, without mutual interaction.
Fourth, Iranian sanctions weariness on the one hand and U.S. Middle Eastern war weariness on the other have produced a rare moment of mutual interest in exploring openings that might overcome or mitigate decades of hostility that now serve the interests of neither power.
Luckily this debate ended with mutual visits that resulted in opening of cooperation between Hungarian Government and the Islamic Community in Bosnia which aspires to be a role-model for integration of European Muslims.
To recap: While our suggestion for process-responsiveness stemmed from the challenge that opening-up does not often occur at the R&D level, three further challenges regarding mutual responsiveness appear where such opening-up is (allegedly) ensued.
Once you have enough money in your savings account to meet opening balance requirements for a mutual fund, open a more aggressive investment vehicle, perhaps a stock index fund.
But securities firms and mutual funds had worried that a partial opening might further damage investor confidence, and pressed the markets to reopen in full rather than in a piecemeal fashion.
But he added that the signing of a mutual confidentially agreement with the TMX and the opening of discussions "is a positive step".
A mutual appreciation for the roe led to the opening in 2001 of Caviar Court in Dammam, the kingdom's third-largest city, on the eastern shore along the Gulf.
