Definition of nesting in US English:

nesting

adjective

  • 1(of a bird or other animal) building or occupying a nest.

    ‘do not disturb nesting birds’
  • 2(of similar objects of graduated sizes) able to be placed or stored one inside the other.

    ‘solid wood nesting tables’

Pronunciation

nesting

/ˈnestiNG//ˈnɛstɪŋ/