extremely meaning
EN
[ɪksˈtriːmli] 
US - AdverbCOMmore extremelySUPmost extremelySUF-ly
- More Examples
- Used in the Middle of Sentence
- Previous reports on unilateral LR recession commonly show extremely low rates of initial overcorrection and large exodrifts after surgery suggesting that the surgical dose may be increased.
- As CACS values were extremely skewed, logarithmized CACS + 1 was used for the comparison of between the groups.
- The birth control pill, under sophisticated falsificationism, is considered extremely effective since the statistics show only a 0.3% failure rate.
- Used in the Middle of Sentence
Definition of extremely in English Dictionary
- Part-of-Speech Hierarchy
- Adverbs
- Degree adverbs
- Degree adverbs
- Morphemes
- Suffixes
- Words by suffix
- Words suffixed with -ly
- Words suffixed with -ly
- Words by suffix
- Suffixes
- Adverbs
Source: Wiktionary
Grammatically, this word "extremely" is an adverb, more specifically, a degree adverb. It's also a morpheme, more specifically, a suffixe.