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triennially [traɪ'enɪǝlɪ] adj. stresses
gen.	раз в три года (occurring or being done every three years: The population was registered; a land tax (based on the nature of the crops and the amount of arable land) was instituted and revised triennially 'More); чрез три года; по три года
triennially [traɪ'enɪǝlɪ] adv.
gen.	каждые три года ('More); через каждые три года ('More); один раз в три года ('More)