1. An active verbal support for a cause or political position, etc.: At the political convention, there was a lot of advocacy, or backing up, for the experienced and wise candidate for the office of U.S. President.
2. The act of speaking or writing, in support of something, such as an idea, a cause, or a policy, and giving active support: Jane’s advocacy for the local animal rights group helped convince the public to donate more money for saving the lives of stray animals.