apperceiving massn. [compare J. F. Herbart's expression (1825) ‘appercipirende Vorstellungsmasse’] = apperception mass at apperceptionn. Compounds, and cf. apperceptive mass at apperceptiveadj. and massn.2 6c.
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1890 W. JamesPrinc. Psychol. II. xix. 109 A child who hitherto has seen none but four-cornered tables apperceives a round one as a table; but by this the apperceiving mass (‘table’) is enriched.