senior

1、sen- 是"老"（拉丁 senex 老人），-or 是比较级尾巴，合起来字面就是"更老的"——所以 senior 既指年纪大，也指资历深、级别高，senior manager 高级经理。
2、-ior 结尾的都带比较级：junior 更年少、prior 在前的、superior 更高的、inferior 更低的。senior 和 junior 配一对记最省事。
3、同 sen-（老）一家：senate 参议院（字面是一群老人）、senile 年迈的。sir（先生）这个称呼也是从 senior 传下来的。

senior 年长的，老年的，高级的

sen-,年老，-or,比较级后缀，词源同 prior.即更老的，引申诸相关词义。

senior

senior: [14] Senior was borrowed direct from Latin senior, which was the comparative form of senex ‘old’. This in turn was descended from the Indo-European base *sen-, which also produced Welsh hen, Gothic sineigs, Lithuanian senas, and Armenian hin, all meaning ‘old’. English is also indebted to senex for senate and senile [17], while senior has contributed sir and the whole range of Romance terms of address, including monsieur, sennor, and signor.
=> senate, senior, sir

senior (adj.)

late 13c., from Latin senior "older," comparative of senex (genitive senis) "old," from PIE root *sen- "old" (see senile). Original use in English was as an addition to a personal name indicating "the father" when father and son had the same name; meaning "higher in rank, longer in service" first recorded 1510s.

The Latin word yielded titles of respect in many languages, such as French sire, Spanish señor, Portuguese senhor, Italian signor. Senior citizen first recorded 1938, American English.

senior (n.)

mid-14c., "person of authority;" late 14c., "person older than another," from senior (adj.). Sense of "fourth-year student" is from 1741, from earlier general sense of "advanced student" (1610s).

1. All senior officers involved in the coup will have to be removed.

所有参与政变的高级官员都将被免职。

2. Senior officers could be considering a coup to restore authoritarian rule.

高官们可能会策划一场政变来复辟独裁统治。

3. Williams felt himself to be senior to all of them.

威廉斯认为自己比其他所有人资格都要老。

4. Senior politicians met today to discuss the future of European economic unity.

高级政要今天会晤，探讨欧洲经济一体化的未来。

5. A senior White House official said the agreement is close.

白宫的一位高级官员说即将达成协议。