Word Unit: ataxo-, ataxia- (Greek: disorder, without order)
Word Unit: -ate (office of) (Latin: a suffix; office of, office holder)
Word Unit: -ate (to do) (Latin: a suffix; to do, to make, to cause, or to act upon; to do something with)
Word Unit: atelo-, atel-, ateli- (Greek: imperfect, incomplete)
Word Unit: ath-, athl- (Greek: struggle, a contest [in war or in sports], to contend for a prize; physical activity, rigorous self-discipline or training)
Word Unit: athero-, ather- + (Greek: groats, meal, porridge; soft, pasty materials)
Word Unit: athro- + (Greek: collective)
Word Unit: -atic (Greek > Latin: a suffix; pertaining to; of the nature of)
Word Unit: -ation, -ization (-iz[e] + -ation); -isation (British spelling variation) (Greek > Latin: a suffix; action, act, process, state, or condition; or result of doing something)
Word Unit: -ative + (Latin: a suffix; tending to)
Word Unit: atlantic, Atlantic + (Greek > Latin: Atlanticus, pertaining to the Atlantic Ocean or to Mount Atlas; from the Atlas mountains)

Inter-related cross references, directly or indirectly, involving the "sea" and the "ocean" bodies of water: abysso- (bottomless); batho-, bathy- (depth); bentho- (deep, depth); halio-, halo- (salt or "the sea"); mare, mari- (sea); necto-, nekto- (swimming); oceano-; pelago- (sea, ocean); plankto- (drifting); thalasso- (sea, ocean).

Word Unit: atlanto-, atlant- + (Greek: Atlas, atlas; Atlant[os])
Word Unit: atlas (Greek > Latin: one of the Titans, son of Iapetus and Clymene, supporting the heavens on his shoulders; later, a king of Mauretania, changed by Perseus into Mt. Atlas [Greek mythology])
Word Unit: atmido-, atmid- + (Greek: smoke, vapor, steam; from amis, atmidos, "smoke, vapor")

Inter-related cross references, directly or indirectly, involving word units dealing with "smoke, smoking": capno; Capnomania & Fumimania, Pt. 1; Capnophobia & Fumiphobia, Pt. 1; fumi-; nebula-; typho-.

Word Unit: atmo-, atm- + (Greek: vapor, steam; air, gas; respiration)

Cross references of word groups that are related, directly or indirectly, to: "air, wind": aello-; aeolo-; aero-; anemo-; austro-; flat-, flatu-; phys-; pneo-, -pnea; pneumato-; turb-; vent-; zephyro-.

Word Unit: -ator + (Latin: a suffix that forms masculine nouns from verbs)
Word Unit: atrio-, atri- + (Latin: entrance hall or chamber; upper heart chamber; central room)
Word Unit: atroc-, atroci- + (Latin: cruel, fierce; dark-looking, gloomy)
Word Unit: atto- [A toh] (Danish or Norwegian: eighteen; a decimal prefix used in the international metric system for measurements)

Related "metric" families: yotta; zetta; exa; peta; tera; giga; mega; kilo; hecto; deka; deci; centi; milli; micro; nano; pico; femto; zepto; yocto.

Word Unit: Attosecond Spectroscopy (essential physics of the emission of attosecond light pulse)