building meaning
EN
[ˈbɪldɪŋ] [-ɪldɪŋ] 
US UK WBuilding
- A building is a man-made structure with a roof and walls standing more or less permanently in one place, such as a house or factory.
- Buildings serve several needs of society – primarily as shelter from weather, security, living space, privacy, to store belongings, and to comfortably live and work.
- Ever since the first cave paintings, buildings have also become objects or canvasess of artistic expression.
FR building 
- NounPLbuildingsSUF-ing
- NU The act or process of building.
- The building of the bridge will be completed in a couple of weeks.
- A closed structure with walls and a roof.
- One particularly damaging, but often ignored, effect of conflict on education is the proliferation of attacks on schools [ …] as children, teachers or school buildings become the targets of attacks. Parents fear sending their children to school. Girls are particularly vulnerable to sexual violence.
- NU The act or process of building.
- Verb
- More Examples
- Used in the Middle of Sentence
- Secretary of a building society—regular chapel-goer, teetotaller, and all that.
- Police sealed off the building following an anonymous bomb warning.
- Passive solar energy utilizes building constituents such as walls, floors, roofs, windows, exterior building elements and landscaping to control heat generated by sun.
- Used in the Beginning of Sentence
- Building on the case for tough-mindedness, King identifies the dangers of soft-mindedness. He writes that the soft-minded are prone to embrace all kinds of superstitions.
- Used in the Ending of Sentence
- A survey of the stores of a ship; a survey of roads and bridges; a survey of buildings.
- The soldiers split up into smaller squadrons to search the building.
- The soylent steaks were sitting like lead in his stomach and twice he had to go back to the dark and miserable toilet in the rear of the building.
- Used in the Middle of Sentence
Definition of building in English Dictionary
- Part-of-Speech Hierarchy
- Nouns
- Countable nouns
- Singularia tantum
- Uncountable nouns
- Uncountable nouns
- Countable nouns
- Verbs
- Verb forms
- Participles
- Present participles
- Present participles
- Participles
- Verb forms
- Nouns
- fr building
- en buildings
- fr buildings
- en building up
- en building on
Source: Wiktionary
Grammatically, this word "building" is a noun, more specifically, a countable noun and a singularia tantum. It's also a verb, more specifically, a verb form.