This is a great word a learnt recently! It means that sense of peer-to-peer understanding that we get when communicating with someone we don’t necessarily know, but with whom we share some common bond, e.g. professional status. So, a doctor speaking to another doctor will always get a fair hearing on a controversial subject, whereas a manager or politician may not.
It doesn’t mean that your peer will agree with you unthinkingly, but you will at least get a ‘foot in the door’ to make your pitch. If you don’t have homophily with your audience, you should consider ‘buying it in’; in other words, bring someone with you who does, and let them do the talking.
Bear in mind that homophily works best the closer the bond. Thus, a doctor-doctor bond is fine, but a GP-GP bond works better than a GP-Consultant one.
Homophily is crucial for clinical engagement with controversial subjects and sceptics!