释义 |
in·gres·sion \ə̇nˈgreshən\ noun (-s) Etymology: Middle English, from Latin ingression-, ingressio, from ingressus (past participle) + -ion-, -io -ion 1. : the action of entering : entrance 2. : the process whereby potentialities or eternal objects enter into or become complex actual occasions or events < the ingression of an object into an event is the way the character of the event shapes itself in virtue of the being of the object — A.N.Whitehead > 3. : inward migration in gastrulation of large yolk-laden macromeres formed by holoblastic but markedly unequal cleavage |