adverb, noun which may take the genitive case particle 'no'
to that extent; so much; that much
Expresses a high degree or extent, often with a nuance of surprise or emphasis. Used adverbially or adjectivally with の.
Even though I warned him so much, he forgot again.
Even though I practiced that much, I lost the match.
あれほどの才能があれば、成功するだろう。
With that much talent, he will probably succeed.
あれほど美しい景色は見たことがない。
I've never seen scenery that beautiful.
This is the first time I've seen damage that severe.
あれだけ is common in spoken Japanese and can feel more emphatic, while あれほど is more formal and often used in written language, though both mean 'to that extent'.
あれほど points to a degree tied to something distant from both speaker and listener, while それほど points to a degree tied to something near the listener or already mentioned.
あれほど refers to a degree associated with something distant from the speaker, while これほど refers to a degree associated with something close to the speaker.
Kanji form using 程; seen in some written contexts.
Rare kanji form using 彼; may be confused with other readings.
Compound of あれ (that, distal demonstrative) and ほど (extent, degree).