köken: From Punkt + -lich. Further from Latin punctus (p.p.p. of pungō), whence also English point, punctual. Compare typologically Russian то́чный (tóčnyj) (akin to то́чка (tóčka), ты́кать (týkatʹ)).
punctual, keen · exact, precise, accurate · clean-cut, clear-cut
çekim: karşılaştırma по́-то́чни · üstünlük на́й-то́чни
köken: A merge between: * Proto-Slavic *tъčьnъ (“acute, punctual”) (from the root of тъка́ (tǎká, “to thread”), то́ча (tóča, “to whet, to sharpen”)), which is formally expected to yield **тъчен; * Proto-Slavic *točьnъ (“sprung, derivant”) (from the root of то́ча (tóča, “to drain”), ток (tok, “current”)). The semantics of the modern term has been explicated with the advent of scientific rigour.
From an earlier adjectival use of stip (“point, dot”) (compare French ponctuel, ultimately from Latin punctus (“point”)). The -t is a secondary extension of unclear origin, perhaps by analogy with strikt.