use of both English and Spanish in an utterance (also referred to as using Spanglish).

Process of changing one's speech to match the situation, as with people who are bilingual.

The alternate use of two languages, or switching back and forth. This usually occurs between two bilinguals who speak the same language(s) and involves special social and communicative skills. This differs from the incorporation of the native language into the second language as when a person is trying to communicate beyond his or her level of competence in the second language. Also, it is not interference of the first language as was once believed by linguists.

The practice of using more than one language to express a thought or an idea.

Changing from one language variety to another in discourse. Speakers shifts dialects and registers, and writers switch register and style according to contexts and purposes. Some speakers mix languages in their discourse in systematic ways; for example, Chicano English speakers use Spanish in systematic ways in their code switching.