ăm-o (amāt-), I love; amī-cus, friend: am-ity, amor-ous, amatory, amour, amic-able, ami-able, in-imic-al, en-emy and enamoured (Fr.).
anim-a, air, breath of life; anim-us, mind: anim-al, anim-ate, anim-osity, anim-advert (see [verto]), un-anim-ous, equ-anim-ity (aequus), animalcule.
ann-us, year: ann-als, ann-uity, anni-versary (verto), annual, per-enn-ial.
antiqu-us (anticus), ancient: antique, antiquary, antiquity, antic.
apt-us, fitted, suitable; in-ept-us, senseless: apt, aptitude, ad-apt, in-ept.
aqua, water: aqu-atic, aqueous, aquarium, aque-duct (duco).
arbiter, (arbitr-), umpire: arbiter, arbitrate, arbitra-ment, arbitrary.
ar-, join—ar-ma, fittings, arms; ar-tus, joint: arm, armour, army, armament, article, articulate; armada and armadillo (Span.), armi-stice (sto).
ar-s (same root as above), skill: art, artisan, artist, artifice (fac-), in-ert.