assertion
/əˈsɜːʃən/noun
1- a confident and forceful statement of fact or belief断言, 语气肯定的话：
with clause his assertion that his father had deserted the family.他对他父亲已抛弃家庭这一事件的断言。
1.1
- mass noun the action of stating something or exercising authority confidently and forcefully肯定有力的主张; 行使权利：
the assertion of his legal rights.
他合法权利的行使。