ad invicem

• adinvicem

From ad- +‎ invicem

ad invicem (not comparable)

1. (Late Latin, Medieval latin) mutually, each other, reciprocally, one another
   • 12th century, Geoffrey of Monmouth, De Gestis Britonum III:

     Nec mora, amici facti sunt adinvicem et cohortibus exarmatis urbem Trinovantum venerunt.

     They immediately befriended eachother, and, having disarmed their troops went to the city of Trinovantum.