The word is... bicentennial.
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The word century means 100 years FYI: decade means 10 years
A century means one hundred consecutive years, and adjective form is centennial. The adverb form centennially is rarely used.
The word 'percent' means 'every hundred'. 51 percent is 51 / 100 or 0.51
Triennial, from Latin "triennium".
Because the term percent means per cent as in the Latin word "for every hundred"