Use 'autumnal' to describe events that occur in or are associated with the autumn season. The autumnal harvest festival is a yearly highlight.
Pro Tip 2/3
Cultural Imagery
'Autumnal' can evoke a sense of coziness, change, or maturity, as these are qualities often associated with fall. She felt an autumnal nostalgia watching the leaves change.
Pro Tip 3/3
Natural Transformation
'Autumnal' highlights the natural changes in the environment, especially the transformation of flora. The park was full of autumnal beauty with its golden leaves.