For him these years were a period of mental growth, of transition, of development.Test your vocabulary with our 10-question quiz!

Expansion, elaboration, growth, evolution ; unfolding, opening, maturing, maturation.In our present stage of development we could hardly do without them.Published by Houghton Mifflin Company.

Development is a leading primary research journal covering the field of developmental biology.British Dictionary definitions for development development noun the act or process of growing, progressing, or developing the product or result of developing a fact, event, or happening, esp one that changes a situation an area or tract of land that has been developed Also called.