1 The tendency to perceive or to remember material in a form closer to a good Gestalt than is objectively the case, unimportant and incongruous details gradually disappearing over time, such alteration also occurring in serial reproduction and rumour transmission. Compare assimilation (5), sharpening.
2 In the terminology of some forms of therapy and counselling, speaking frankly and openly (being level in the sense of straightforward).
3 In linguistics, the gradual loss of linguistic distinctions, such as the loss of the distinction between the nominative and accusative forms of nouns in Old English, which have generally been levelled to a single form, although the distinction has been preserved in some pronouns (I/me, he/him, she/her, they/them) though not in you. US leveling.