Noun

(uncountable) The process of developing; growth, directed change.

* {{quote-magazine, date=2013-07-19, author= Ian Sample

, volume=189, issue=6, page=34, magazine=(The Guardian Weekly) , title= Irregular bedtimes may affect children's brains , passage=Irregular bedtimes may disrupt healthy brain development in young children, according to a study of intelligence and sleeping habits.  ¶ Going to bed at a different time each night affected girls more than boys, but both fared worse on mental tasks than children who had a set bedtime, researchers found.}}

(uncountable, biology) The process by which a mature multicellular organism or part of an organism is produced by the addition of new cells.

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Of more significance in the nature of branch development ; in the Jubulaceae, as in the Porellaceae, branches are acroscopic and normally replace a ventral leaf lobe.

(countable) Something which has developed.

(real estate, countable) A project consisting of one or more commercial or residential buildings, real estate development.

(real estate, uncountable) The building of a real estate development.

(uncountable) The application of new ideas to practical problems (''cf. research).

(chess, uncountable) The active placement of the pieces, or the process of achieving it.

(music) The second section of a piece of music in sonata form.

Noun

(uncountable) The process by which an organism produces others of its kind; breeding, propagation, procreation, reproduction.

(countable) The act of increasing or rising; augmentation, amplification, enlargement, escalation, aggrandizement.

* {{quote-magazine, date=2013-07-19, author= Mark Tran

, volume=189, issue=6, page=1, magazine=(The Guardian Weekly) , title= Denied an education by war , passage=One particularly damaging, but often ignored, effect of conflict on education is the proliferation of attacks on schools

(countable) The result of building up; buildup, accretion.

(uncountable) The spread of biochemical, nuclear and other weapons of mass destruction to countries not originally involved in developing them.