Used in a metaphorical sense to refer to the basis of an argument or idea.
La educación es el alicer de una sociedad próspera y justa, dado que permite el desarrollo de habilidades.
Education is the foundation of a prosperous and just society, given that it allows for the development of skills.
La alicer de este edificio es tan sólida que ha resistido varios terremotos a lo largo de los años.
The foundation of this building is so solid that it has withstood several earthquakes over the years.