noun. 
                    Originally, a system of roots; a secure attachment (in something); a firm grounding.
                  
                
                  
                    noun. 
                    The process of forming roots.
                  
                
                  
                    noun. 
                    A method of creating a new plant by getting part of an existing plant to form roots.
                  
                
                  
                    verb. 
                    Present participle of root.