sentence

The American Heritage Dictionary offers the following definition:

sen·tence (sěn’təns) n.

1. A grammatical unit that is syntactically independent and has a subject that is expressed or, as in imperative sentences, understood and a predicate that contains at least one finite verb.

I, therefore, present to the world Peter’s first self-assembled sentence, uttered repeatedly until the request was honored:

“I want juice.”

It seems to meet the defined criteria. It’s blunt, not terribly polite, but delightful to hear!

Go Peter!