The word 'summary' originates from the Latin 'summarius', an adjective meaning 'of or pertaining to the sum or chief point'. This derives from 'summa', the feminine form of 'summus' meaning 'highest, topmost', which itself is a superlative from the Proto-Indo-European root uper- (over). The conceptual journey is from the physical sense of 'the topmost part' to the abstract 'chief point or gist' of a matter. The modern meaning of a concise presentation of main points directly retains this core idea of extracting the highest, most essential elements. The adjectival sense of 'done without delay or formality' evolved from the notion of dealing only with the chief points, omitting lengthy procedures.

Structure: sum (highest) + mary (noun suffix) - sum: From Latin 'summa', meaning 'the highest part, chief point, gist'. In this word, it functions as the core root conveying the idea of the main or essential part. - mary: A variant of the suffix '-ary', from Latin '-arius', used to form nouns and adjectives. Here, it forms a noun meaning 'a thing pertaining to or connected with the sum'.