4. ann, enn

[L] = year年

ann来自拉丁名词annus，意思为year（年）；

enn是ann在添加前缀时产生的音变异体。

ann在构词中常带有连接字母-u-或-i-，也可以把annu和anni作为词根异体看待。

annual

[annu=year年；-al a.=of……的→]

I a. of one year;yearly一年的；每年的

annual report年度报告

Ⅱn. book or pamphlet issued once a year年鉴；年刊

the annuals of the Historical Society历史协会的年鉴

anniversary

[anni=year 年；vers=to turn 转；-ary n.=thing物→“the date connected with the turning of a year与时间周转一年相关的日子”→]

n. the date of a year on which something happened周年纪念日

the 400th anniversary of Shakespeare's birth莎士比亚诞生四百周年纪念日

annals

[ann=year年；-al n.=thing物；-s 表复数→“many things of a year一年中的事情”→]

n. yearly records;historical records编年史；历史记载

the war annals of the Red Army红军战史

• annalist [annal(s);-ist n.] n.编年史作者

perennial

[per-=through通；enni=year年；-al a.→“through a year通年的”→]

a.①lasting through the year常年不断的

perennial snow and ice终年不化的冰雪

② overlasting长久的

perennial efforts持久努力

• perenniality [perennial;-ity n.] n.常年性；长久性

annuity

[annu=year 年；-ity n.=thing connected with 表相关事物→“money connected with one year 按一年计算的钱”→]

n. yearly allowance or income年金；年收入

life annuity终身年金

• annuitant [annuit(y);-ant n.] n.领受年金者

superannuate

[super-=over超；annu=year年→age年龄；-ate v.=to cause to be使成为→“to cause to be over-aged使成为超龄者”→]

v. make to retire when one is over a certain age因超过年龄而令退休

He was superannuated as soon as he reached the age of sixty.他刚满六十岁，就被指令退休了。

annu和enni还能与表示数目的前缀构成表示以“年”为单位的时间的单词。以下是常见的几个。

semiannual

[semi-=half半；annu=year年；-al a.=of……的→]

a. of a half year半年一度的

semiannual meeting半年一度的会议

biannual

[bi-=two, twice二，两次；annu=year年；-al a.=of……的→]

a. of twice a year每年两度的

biannual examination每年两次的考试

biennial

[bi-=two二；enni=year年；-al a.=of……的→“of two years二年的”→]

a. lasting two years持续两年的

a biennial research course两年的研究课程

biennium

[bi-=two二；enni=year年；-um n.=thing物→“the time of two years两年的时间”→]

n. period of two years 两年