1
                    
        a(1)
    
                
                                          
              
          
                                                      : the alternate rising and falling of the surface of the ocean and of water bodies (such as gulfs and bays) connected with the ocean that occurs usually twice a day and is the result of differing gravitational forces exerted at different parts of the earth by another body (such as the moon or sun)                                      
                
                    
        (2)
    
                
                                          
              
          
                                                      : a less marked rising and falling of an inland body of water                                      
                
                    
        (3)
    
                
                                          
              
          
                                                      : a periodic movement in the earth's crust caused by the same forces that produce ocean tides                                      
                
                    
        (4)
    
                
                                          
              
          
                                                      : a periodic distortion on one celestial body caused by the gravitational attraction of another                                      
                
                    
        (5)
    
          
                                          
              
          
                                                      : one of the periodic movements of the atmosphere resembling those of the ocean and produced by gravitation or diurnal temperature changes                                      
                
                    
2
                    
        a
    
          
                                          
              
          
                                                      : something that fluctuates like the tides of the sea                                      
              
                             
the tide of public opinion
                         
                
                    
        b
    
          
                                          
              
          
                                                      : a large and increasing quantity or volume                                      
              
                             
a tide of opportunists
                                       a swelling tide of criticism
                         
                
                    3
                    
                  4
                    
        a
    
          
                                          
              
          
                                                      : a fit or opportune time : opportunity                                      
                
                    
        b
    
          
                                          
              
          
                                                      : an ecclesiastical anniversary or festival                                      
                
                                
            also                
          
                                                      : its season                                       
                
                  —usually used in combination 
            Eastertide      
                
    
            
        c
    
          
                                obsolete 
                                  
              
          
                                                      : a space of time : period                                      
                
                    
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  Merriam-Webster unabridged




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