- 1最頂端的、最上面的
Highest — at the very top of something, with nothing above it. It is an adjective, and it sits in front of a noun: the topmost branch, the topmost shelf, the topmost floor of the building. You would not say "the branch is topmost" — English speakers keep this word before the noun, not after the verb be. It is a little more literary than everyday speech; in conversation people usually say "the top branch" or "the highest shelf". You will meet topmost most often in writing — stories, descriptions of buildings and mountains, and technical writing about layers (in computer drawing programs, the topmost layer is the one that covers all the others). The -most ending is doing one job: it pushes the word to the extreme end of the scale. English has a small family of these: innermost, , uppermost, foremost, hindmost, . They all mean "the very ___-est one". Note that topmost and uppermost mean almost the same thing, but uppermost is also used for ideas — "that question was uppermost in my mind" — and topmost is not.
組成top（頂端）+ -most（最…的）. The -most ending comes from Old English -mest, and it is a kind of accident: it began as a doubled ending, two different "most extreme" endings stuck together, and later speakers heard it as the word most.
原始詞典資料2 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。
topmostadj/tɒpˈməʊst/
- 1
At or nearest to the top; uppermost; being the very highest.
- Well! well! ^([sic]) cried I, as the coachman turn’d in at the gates, I find I shall do very well : and by the time he had wheel’d round the court, and brought me up to the door, I found myself so much the better for my own lecture, that I neither ascended the steps like a victim to justice, who was to part with life upon the topmost, nor did I mount them with a skip and a couple of strides, as I do when I fly up, Eliza! to thee, to meet it.
- When he has defended THE TRIPLE FORTRESS of Religion, Morality, and Literature, from it's^([sic]) foundation to the topmost battlements, must he be left on the field without the common honours of a common soldier?
- 2
Of greatest status, esteem, or prestige; best.
- If Aeschylus’ art at its topmost excellence is to be seen only in the trilogy of indissolubly connected parts, it is not true, as is sometimes maintained, that his art is to be judged exclusively on the basis of the three-part drama.
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。