1 : having important issues or results; "the year's only really consequential legislation"; "an eventful decision"
2 : occurring with or following as a consequence; "an excessive growth of bureaucracy, with attendant problems"; "snags incidental to the changeover in management"; "attendant circumstances"; "the period of tension and consequent need for military preparedness"; "the ensuant response to his appeal"; "the resultant savings were considerable"; "collateral target damage from a bombing run"