highest meaning
EN
[ˈhaɪ.ɪst] 
US - AdjectiveBFhighCOMhigherSUF-est
- superlative form of high: most high.
- superlative form of high: most high.
- AdverbBFhighCOMhigher
- superlative form of high: most high.
- superlative form of high: most high.
- More Examples
- Used in the Middle of Sentence
- We almost convinced his dad to ride the roller coaster, but he chickened out when he saw how high it went.
- I put the high crime rate down to the high unemployment.
- The runner had high hopes, but was out of contention after the first heat.
- Used in the Beginning of Sentence
- High serum concentration of globotriaosylsphingosine (lyso-Gb3), indicating the presence of deacylated Gb3, has been observed in patients with FD [4 ].
- Higher weighting was assigned to data from double-blind studies.
- High school was difficult, but it was a walk in the park compared to college engineering classes.
- Used in the Ending of Sentence
- To get the rectangle to hide some of the text, make its z-order higher.
- Cattle futures: spillover momentum plus evidence of a strong stopper (i.e., 96 loads demanded) should kick the opening higher.
- I haggled for a better price because the original price was too high.
- Used in the Middle of Sentence
Definition of highest in English Dictionary
- Part-of-Speech Hierarchy
- Adjectives
- Adjective forms
- Adjective superlative forms
- Adjective superlative forms
- Adjective forms
- Adverbs
- Adverb forms
- Adverb superlative forms
- Adverb superlative forms
- Adverb forms
- Adjectives
Source: Wiktionary
Grammatically, this word "highest" is an adjective, more specifically, an adjective form. It's also an adverb, more specifically, an adverb form.