From Old French 'ataindre' (to reach), blending Latin 'attinēre' (to hold to) and 'attingere' (to touch upon), from PIE *ten- (to stretch).
To succeed in achieving something, especially after much effort; to reach a specified age, size, or level.
From Old French "ataindre" (to reach, to achieve, to strike), from Vulgar Latin *attangere, a restructuring of Latin "attingere" meaning "to touch upon, to reach, to arrive at," composed of "ad-" (to, toward) and "tangere" (to touch). Latin "tangere" derives from Proto-Indo-European *teh₂g- (to touch, to handle), a root that generated a rich network of tactile vocabulary. PIE *teh₂g- produced Greek "tetagon" (having seized, from the aorist of a lost verb), Old English "þaccian" (to pat, to stroke — whence modern "thatch" via the sense of laying on), and Latin derivatives