What is the correct definition of a base?

[tonyhu]

And difference between base and lewis base?

[Reina Robles 2B]

A base and a Lewis base are the same thing. Lewis base just states how Lewis describes bases (donating an electron).

[Sukanya Mohapatra 2G]

In chemistry, a base is a chemical species that donates electrons, accepts protons, or releases hydroxide (OH-) ions in aqueous solution. Types of bases include Arrhenius base, Bronsted-Lowry base, and Lewis base.

[805394719]

There are two definitions for both acids and bases. These are Bronsted acid and bases and Lewis acid and bases, both of which define an acid and a base in a different way. A Bronsted acid is a substance that donates hydrogen ions to the solution it is found in, whereas a Bronsted base is a substance that donates hydroxide ions to the solution it is found in. A lewis acid, on the other hand, is the lone pair acceptor, whereas a Lewis base is the lone pair donor.

[Anvi Brahmbhatt 4A]

Specifically, a Lewis base is defined as a an electron donor.

[Eunice Nguyen 4I]

A base are substances that, in aqueous solution, release hydroxide (OH−) ions.
A Lewis base can donate a pair of nonbonding electrons.