Other forms: conciliations
When you calm someone down, soothing their anger or distrust, that's conciliation. Conciliation is an important part of making peace between two warring countries.
If you've had a misunderstanding with a friend that you're determined to put right, there's likely to be a tone of conciliation in your voice as you invite her to meet for lunch. You can also use conciliation to bring two other people or groups to an understanding, the way a mediator does when people get divorced, or a peacekeeper works with hostile countries. The Latin root, conciliationem, means "a connection, union, or bond," or literally, "a making friendly."