Completion

Under completion is understood in mathematics:

Completion of metric and normed spaces, in particular
Completion of uniform spaces in the topology
Order completion of a total order using Dedekind cuts
Completion of a measure in measure theory
Completion of a ring or a module with respect to a filtration or an ideal in the ring theory, see completion ( Commutative Algebra )
Set of Lindenbaum, possibility of completing a set of predicate logic formulas in mathematical logic