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1885 D. G. Brinton in Proc. Amer. Philos. Soc. 22 iv. 319 Besides the grammatical form of a language, Humboldt recognized another which he called its internal form.]

1888 H. A. Strong tr. H. Paul Princ. Hist. Lang. xx. 460 The influencing force extends merely to what Humboldt and Steinthal have described as the inner language form (‘innere Sprachform’).

1888 H. A. Strong tr. H. Paul Princ. Hist. Lang. xx. 471 A language suffers influence in its inner linguistic form principally in the mouths of those who speak it as a foreign tongue.

1901 H. Oertel Lect. Study Lang. i. 64 This is the ‘outer speech form’, the external, phonetic aspect of the speech symbols. The ‘inner speech form’ is the definite arrangement of the prelinguistic psychical material into definite groups, the coherence of each group being secured by labelling each with one definite sound-tag.

1930 J. R. Firth Speech v. 44 The early discussions on inner speech did not touch the bigger question of the extensive motor accompaniment of thought.

1934 Webster's New Internat. Dict. Eng. Lang. Inner speech, Psychol., use of words or word images in thinking, without audible or visible speaking.

1934 Webster's New Internat. Dict. Eng. Lang. Inner speech form (trans. of G. innere Sprachform, used by Humboldt and Steinthal), the mental concept or image associated with a word prior to its use or upon hearing or reading it, as the concept of a quadruped associated with the word ‘animal’; abstractly, the quality by which a word evokes such a mental picture.

1970 H. C. Shands Semiotic Approaches to Psychiatry 10 Inner speech systems are constructed throughout the developmental period in human beings.