What literary term is used in the sentence I began to feel unmistakably out of place that pleasant family circle?

The literary term used in the sentence "I began to feel unmistakably out of place that pleasant family circle" is anaphora.

Anaphora is the repetition of a word or phrase at the beginning of successive clauses, phrases, or sentences. In this case, the phrase "out of place" is repeated twice, creating a sense of emphasis and highlighting the feeling of isolation.