Mercury in 11th House synastry relationships are formed based on common scientific and intellectual interests. The partners are socially active and can successfully cooperate in informal organizations and groups of like-minded people. They have many common friends. By stimulating each other in terms of originality of thinking, the partners gradually achieve almost complete mutual understanding at the evolutionary level they are at the moment.
In a positive scenario, you can confidently speak of the high efficiency of Mercury in Eleventh House synastry in the formation of strong relationships between the partners, both in the professional and domestic sphere. Even its marital and romantic relationships are characterized by lasting friendship rather than emotional or purely physical attraction, the presence of which, however, is not excluded altogether if the other factors are favorable.
from F. Sakoyan, L. Ecker
Mercury in 11th House Synastry Explained
Mercury in 11th House synastry partner may be interested in your participation in various group activities: it will awaken his mental activity, and some of his ideas may seem quite healthy and apropos. However, it will not be easy to transfer his interest to your personal affairs, especially if he himself does not belong to your social groups. In informal circumstances, the two of you can seem like a very friendly couple; in any case, the reasoning of your Mercury in Eleventh synastry partner, as a rule, will convince you, and his talents in the field of commerce will not raise doubts, and you will gladly help him.
Temptations and potential overlaps? There are many, especially if the partner’s Mercury is afflicted and underdeveloped – then they will be inclined to deceive you or carry out various shenanigans in the group with your help in order to take an advantageous position in it or enrich themselves at the group’s (and your) expense. If your Eleventh House is struck, you may completely misunderstand the words of your partner when they are intended to have a friendly meaning, suspecting dishonesty and a desire to exploit your friendship, etc. Nevertheless, here too, hard work yields excellent results, in particular, good relations and mutual understanding in larger groups whose dynamics and politics may start unfolding right before your eyes without any deliberate effort on your part.
from A. Podvodny