From the United Nations Intergovernmental Panel on Climate Change:
Climate Change 2022: Mitigation of Climate Change
The Working Group III report provides an updated global assessment of climate change mitigation progress and pledges, and examines the sources of global emissions. It explains developments in emission reduction and mitigation efforts, assessing the impact of national climate pledges in relation to long-term emissions goals.
Climate mitigation refers to efforts to reduce emissions.
Adaptation refers to efforts to adapt to any climate change.