day: Tag; etc. H. 71 , 179 , 370 f, 409 , 412 f, 415 [BTMR  ]

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Heidegger’s interpretation   of Dasein   purports to show it ‘as it is firstly and mostly [zunächst   und zumeist] in its average everydayness [Alltäglichkeit  ]’ (SZ, 16). Tag, ‘day’, and all, ‘all, every’, furnish: Alltag, ‘weekday; everyday life’; alltäglich, ‘daily; everyday, ordinary’; and Alltäglichkeit, ‘everydayness, ordinariness’. In contrast to a ‘distinctive, definite way of existing’, everydayness is Dasein’s ‘indifferent Firstly and Mostly [Zunächst und Zumeist]’. Since it is so close to us, it is usually overlooked: ‘What is ontically closest and most familiar is what is ontologically furthest, unknown and constantly overlooked in its ontological meaning’ (SZ, 43). Alltäglichkeit ‘clearly means that mode of existing which Dasein observes “every day” [‘alle Tage’].’ [Inwood  ; InwoodHD]