Someone with authority calls, and you are expected to come. A summons is that call made solid — a voice, a bell, or a sheet of paper with a date on it. It is not an invitation, because choosing not to go is itself an act with a cost.
From the word’s history
From Middle English somouns, from Old French sumunce, from Latin summonēre (to summon) — originally a noun made from the past participle of that verb, which is why the -s is part of the word and not a plural.
從中古英文 somouns 來，再往前是古法文 sumunce，源頭是拉丁文 summonēre（召喚）。它原本是那個拉丁動詞的過去分詞變成的名詞，所以字尾的 -s 一開始就在字裡面，不是複數。
Wiktionary entry for summons, etymology 1 (kaikki:3f6f69a190036ae4:1099947246)
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原始詞典資料6 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
summonsnoun詞源 1/ˈsʌ.mənz/
- 1
A call to do something, especially to come.
- He sent to summon the seditious, and to offer pardon[…]; but neither summons nor pardon was any thing regarded.
- this summons […] unfit either to dispute or disobey
- 2
lawA notice summoning someone to appear in court, as a defendant, juror or witness.
- Four summonses were brought recently on behalf of St. Pancras Borough Council against the British Transport Commission in respect of the emission of smoke by locomotives standing at Camden Motive Power Depot. (The summonses were dismissed)
- 3
governmentmilitarypoliticsA demand for surrender.
summonsverb詞源 1/ˈsʌ.mənz/
- 1
To serve someone with a summons.
- It proposes that those held in the prototype Selfridges cells be kept for a maximum of four hours to have their identity confirmed and be charged, summonsed or given a fine.
這個拼法也被記錄為下列字的變化形：
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。