adverb
Used with comparisons or degree expressions to emphasize a large difference or extent.
この問題ははるかに難しい。
This problem is far more difficult.
彼の成績はクラスで他のはるかに上だ。
His grades are far above the others in the class.
adverb
Describes physical or metaphorical distance; often used with verbs like 見える or 聞こえる.
はるかに富士山が見える。
Mt. Fuji is visible far in the distance.
はるかに汽笛の音が聞こえた。
I could hear the sound of a steam whistle far off.
adverb
long ago; long before
Refers to a distant past; often used in literary or narrative contexts.
はるかに昔、この地には大きな湖があった。
Long ago, there was a large lake in this area.
その伝説ははるかに古い時代にさかのぼる。
The legend dates back to a time long before.
Derived from the adjective 遥か (はるか, 'distant') with the adverbial suffix に. The root はるか is of native Japanese origin, with uncertain further derivation.