词根：-ann-

【词根含义】：年

【词根来源】：来源于拉丁语名词ann.us, ann.i, m(年)。

【同源单词】：annals, anniversary, annual, annuity, biannual

前缀：dec-, deca-, decem-, deci-

【词根含义】：十,十倍;十分之一,分

【词根来源】：dec-用于元音前。  来源于希腊语deka(十)或拉丁语decem, decimus(十)。

【同源单词】：decennial

词根词缀：decem-, decim-, deci-, dec-

【来源及含义】Latin: ten; also, a decimal prefix used in the international metric system for measurements

【相关描述】In the metric [decimal] system, deci- [DE si] is used to show 1/10 of a unit, as 10^-1 [0.1]; tenth [U.S.] and tenth part [U.K.]. The metric symbol is d.

【相关词根词缀】 Related "metric" families: yotta; zetta; exa; peta; tera; giga; mega; kilo; hecto; deka; centi; milli; micro; nano; pico; femto; atto; zepto; yocto.

【同源单词】dean, December, decemvir, decemviral, decemvirate, decennaries

词根词缀：-enni-, -ennial, -ennium

【来源及含义】Latin: year, years

【同源单词】aere perennius, amillennialism, annual, biannual, bicentennial, biennia