noun

• (uncountable) The process of concretizing a general principle or idea by delineating, particularizing, or exemplifying it.
  "There are certain fields in general economics that are at present not so much in need of a broadening of the theoretical basis as in need of a minute working-out and concretization."
• (countable) Something specific which is the result of a process of concretizing a general principle or idea.
  "This movement gave Sherman his first image—a roller skate—a concretization of pure motion."
• (uncountable, medicine, psychology) An inability to generalize or perform abstraction accompanied by excessive concentration on specific details, as in a mental disorder or in cognition by children.
  "Another [patient] commented on the fact that the consultant had referred to two of them as "boys" in the demonstration. The concretization of a schizophrenic is exemplified here. One man thought this word meant that the consultant, in order "to keep things on the level of boy-girl, wanted everyone else to consider her as a girl, so the boys and girls could communicate.""