Definition

1. Adjective: Being two years of age; having lived for two years.

Usage

The word "two-year-old" is a compound adjective used to describe the exact age of a person, animal, or sometimes an object (e.g., a two-year-old car). It is always hyphenated when placed before a noun. When used as a noun phrase to refer to the person or animal of that age, it is also hyphenated.

Examples

• Adjective (before a noun):
  • The two-year-old child is learning to speak in sentences.
  • They adopted a two-year-old dog from the shelter.
• Noun phrase:
  • The two-year-old was fascinated by the bubbles.
  • This toy is suitable for a two-year-old.

Advanced Usage

• The hyphenated form "two-year-old" functions as a single grammatical unit. This pattern is consistent for other ages (e.g., , ).
• When the age follows the noun and uses a linking verb like "is," the hyphens are not used, and "years" becomes plural:

Variants and Related Words

• Two years old: The non-hyphenated form used predicatively (after a verb).
  • My daughter is two years old.
• Year-old: A combining form used with a number to create other age-related adjectives.
  • A fifty-year-old tradition.
• Toddler: A common noun for a young child, typically one learning to walk (around 1-3 years old). This is a related concept but not a direct synonym for the specific age "two-year-old."

Synonyms

• Toddler-aged: (General, not specific to two years)
• Of two years: (More formal or literary, e.g., )

Notes on Meaning

• The term specifically denotes the age of two years. It is precise and factual.
• It often carries connotations associated with that developmental stage, such as curiosity, rapid language acquisition, and increasing independence in a child.

Adjective

1. two years of age