This is the 3107th most frequent Spanish word.
pilar
"Pilar" means "pillar" or "support."
Here, 'pilar' is used metaphorically to denote something foundational or essential in forming a relationship or structure, symbolizing critical importance.
El amor es el pilar fundamental de la familia.
Love is the fundamental pillar of the family.
In this sentence, 'pilar' is used literally to describe a physical structural element that supports a building or construction, indicating actual architectural usage.
La iglesia se sostiene sobre grandes pilares de piedra.
The church is supported by large stone pillars.
Here again, 'pilar' is employed metaphorically, referring to essential components or aspects that ensure the success or functionality of a concept or endeavor.