Ababy’s first use of words usually comes in the form of which are one-word utterances that stand for a whole phrase, whose meaning depends on the particular context in which they are used.

holophrases      

Explanation:

A holophrase is defined as an enunciate memorized by rote learning and being used without any grammatical aim.

In language acquisition, holophrase refers to an utterance produced by a small child in which a particular word expresses the meaning commonly, conveyed in an adult's speech or conversation through a complete sentence.

Holophrases form the base of a child's initial vocabulary and therefore, develops around the twelfth month of age.