More on Tree Diagrams

node

dominate

precede

immediate dominance

mother

daughter

sister

immediate precede

Constituent

 - string of one or more words that syntactically and semantically behave as a unit

 - Y is a constituent of X if and only if X dominates Y

Immediate constituent

 - Y is an immediate constituent of X if and only if X immediately dominates Y

A set of nodes A forms a constituent B, if B dominates all and only the nodes of A