Matsarya

Mahayana

The Abhidharma-samuccaya states:

What is matsarya? It is an over-concern with the material things in life stemming from over-attachment to wealth and honor, and it belongs to passion-lust. Avarice functions as the basis for not letting up in one's concern for the material things of life.

Alexander Berzin explains:

Miserliness (ser-sna) is a part of longing desire (Sanskrit: raga) and is an attachment to material gain or respect and, not wanting to give up any possessions, clings to them and does not want to share them with others or use them ourselves. Thus, miserliness is more than the English word stinginess. Stinginess is merely unwillingness to share or to use something we possess. It lacks the aspect of hoarding that miserliness possesses.

Theravada

The Atthasālinī (II, Book I, Part IX, Chapter II, 257) gives the following definition of avarice (meanness):

It has, as characteristic, the concealing of one's property, either attained or about to be attained; the not enduring the sharing of one's property in common with others, as function; the shrinking from such sharing or niggardliness or sour feeling as manifestation; one's own property as proximate cause; and it should be regarded as mental ugliness.