This is the 10179th most frequent French word.
immatériel
"Immatériel" means "intangible" or "non-material" in English.
Here, 'immatériel' is used to describe something that cannot be touched or is not physical, specifically referring to cultural heritage which exists in ideas and traditions.
Son héritage culturel est immatériel.
His cultural heritage is intangible.
In this instance, 'immatériel' is applied to philosophical concepts which are ideas or constructs that do not have a physical form.
Le concept philosophique est immatériel par nature.
The philosophical concept is intangible by nature.
Here, 'immatériel' contrasts intangible value (emotional, conceptual) with physical value (monetary, material).