/sɛnˈtɛnəri, ˈsɛntnˌɛri; especially British sɛnˈtinəri/Show Spelled[sen-ten-uh-ree, sen-tn-er-ee; especially British sen-tee-nuh-ree]Show IPAadjective, noun, plural cen·ten·ar·ies.
adjective
1.
of or pertaining to a period of 100 years.
2.
recurring once in every 100 years: a centenary celebration.
noun
3.
a centennial.
4.
a period of 100 years; century.
Origin: 1600–10; < Latincentēnārius (adj.), equivalent to centēn(ī) a hundred each (cent(um) 100 + -ēnī distributive suffix) + -ārius-ary
1607, from L. centenarius "of hundred," from centenai "a hundred each," from centum "hundred" (see hundred). Centenarian "person who is 100" is from 1846.