rapport meaning
EN
[ɹæˈpɔɹ] [ɹæˈpoʊɹ] [ɹəˈpoʊɹ] [ɹəˈpɔɹ] [-ɔː(r)] 
US WRapport
- Rapport is a close and harmonious relationship in which the people or groups concerned understand each other's feelings or ideas and communicate well.
- The word stems from the old French verb rapporter which means literally to carry something back; and, in the sense of how people relate to each other means that what one person sends out the other sends back.
- There are a number of techniques that are supposed to be beneficial in building rapport such as: matching your body language (i.e., posture, gesture, etc.); maintaining eye contact; and matching breathing rhythm.
FR rapport 
- NounPLrapports
- A relationship of mutual trust and respect.
- He always tried to maintain a rapport with his customers.
- Relation; proportion; conformity; correspondence; accord.
- A relationship of mutual trust and respect.
Definition of rapport in English Dictionary
- Part-of-Speech Hierarchy
- Nouns
- Countable nouns
- Singularia tantum
- Uncountable nouns
- Uncountable nouns
- Countable nouns
- Nouns
Source: Wiktionary
Grammatically, this word "rapport" is a noun, more specifically, a countable noun and a singularia tantum.