tri --   k

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 three  (every three)

        tricycle – vehicle having three wheels
        tri-weekly - once every three weeks

trinity – definition 1) group of 3

definition 2) the union of the Father, Son, & Holy Ghost in one divine nature 

hydr / hydro 

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water   spelling = hydro    =    hydr + vowel

        hydrous – having to do with water
        hydrodynamics - the study of the power of water 

-- itis    

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inflammation

Note:  double "m"    (-flamm-)

        carditis - inflammation of the heart
        gastritis - inflammation of the stomach

ante --

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before / front   

anteroom - a smaller room before a larger room                           

Important:  a hyphen before a capital letter.

ante-Christian - before the Christian era
 * *  ante meridiem    =    A.M.  (before noon)

-- cracy

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government by 

democracy - government by the people
plutocracy - government by the wealthy

grad

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step     

        downgrade - step down
        graduation - condition of taking a step