(n.) A growing together of parts naturally separate, as of   the fingers toes. 
                        
                    
                    
                        
                        
                            (n.) Concretion; coherence of separate particles; as, the   accretion of particles so as to form a solid mass. 
                        
                    
                    
                        
                        
                            (n.) Gain to an heir or legatee, failure of a coheir to the   same succession, or a co-legatee of the same thing, to take his share. 
                        
                    
                    
                        
                        
                            (n.) The act of increasing by natural growth; esp. the   increase of organic bodies by the internal accession of parts; organic   growth. 
                        
                    
                    
                        
                        
                            (n.) The act of increasing, or the matter added, by an   accession of parts externally; an extraneous addition; as, an accretion   of earth. 
                        
                    
                    
                        
                        
                            (n.) The adhering of property to something else, by which the   owner of one thing becomes possessed of a right to another; generally,   gain of land by the washing up of sand or sail from the sea or a river,   or by a gradual recession of the water from the usual watermark.