English Reference
noun

nesting

n.
US /ˈnɛstɪŋ/ UK /nˈɛstɪŋ/ nest·ing UK spelling nestings

  1. 01 B2 Upper Intermediate

    an arrangement where one object fits inside a larger one.

    the hierarchical arrangement of objects or structures where one is contained within another.

    Simple

    The nesting of the plastic bowls saved a lot of space in the kitchen cupboard.

    In context

    The clever nesting of the tables allowed the small apartment to accommodate guests without permanent clutter.

    Usage

    Often used as an uncountable noun to describe a design feature.

  2. 02 C1 Advanced Technical Computing

    putting one piece of computer code inside another piece of code.

    the practice of placing one self-contained element of code or data within another of the same type.

    Simple

    Too much nesting in your code can make it very difficult for other people to read.

    In context

    Deep nesting of conditional statements often indicates that a function should be refactored for better maintainability.

    Usage

    Commonly refers to 'if' statements or loops placed inside one another.

  3. 03 B2 Upper Intermediate Science

    the process of a bird or animal building a place to live and have babies.

    the biological process or instinctual behaviour of constructing a nest.

    Simple

    We watched the birds begin their nesting in the old oak tree.

    In context

    The conservation group works to protect the beach during the turtles' nesting season.

    Teacher's tip

    In a psychological context, this can also refer to humans preparing their home for a new baby.

In healthy colonies, Argentine ants spread themselves throughout the available nesting space.

Phys.org· 17 Aug 2026

The bald eagle and her mate gained fame during the pandemic, as a livestream tracked their nesting attempts.

The New York Times· 11 Aug 2026
This entry
Level C1 · Advanced
Frequency Frequent
Updated