One way to picture 'onwards': you are already on the way, the road has not ended, and you keep going past the point you have reached. The word is not about setting out and not about arriving. It is about the stretch that comes after where you are now. That stretch can be a real road, a line of time, or the progress of something that keeps getting better.
From the word’s history
Wiktionary analyses 'onwards' as 'on' + '-wards': 'on' carries continuing, '-wards' points at a direction. The two parts together give the sense of heading further in the direction already taken.
Wiktionary 把 onwards 拆成 on 加 -wards：on 帶著「繼續」，-wards 指「朝某個方向」。合起來可以想成「朝著已經在走的方向再往前」，這條線索正好對上它今天的三個用法。
Wiktionary via kaikki (source_ref kaikki:3f6f69a190036ae4:1284833733:3221): "From on + -wards."
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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。
onwardsadv
- 1
Onward.
- Steam also takes charge of South Eastern (former P.L.M.) trains from Paris to Marseilles and the Riviera from Lyons onwards, and of Western Region trains from Le Mans onwards, as also between Paris and Dieppe and Le Havre.
- A Class 158 relegated from express duties turns up to transport me via the flower-bedecked Brighouse station to the trans-Pennine main line at Bradley Junction and onwards to Huddersfield.
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。