DeleteDuplicates

deletes all duplicates from list.

applies test to pairs of elements to determine whether they should be considered duplicates.

Details

DeleteDuplicates[list] deletes all but the first occurrence of each distinct element that appears in list.
DeleteDuplicates also works on associations, removing entries whose values duplicate those earlier in the association.
DeleteDuplicates never reorders elements, but only removes them.
DeleteDuplicates[list] is equivalent to DeleteDuplicates[list,SameQ].

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Delete duplicated elements:

Delete elements whose values duplicate those earlier in the association:

Delete elements that are preceded by at least one larger element:

DeleteDuplicates is similar to Union without sorting:

Avoiding the sort improves the speed substantially:

Delete sublists that have the same total:

DeleteDuplicatesBy can be used to achieve the same result:

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