An Etymological Dictionary of Astronomy and Astrophysics

1a) To do habitually or regularly.

1b) To exercise or follow as a profession.

2a) Performance; the doing of something (contrasted with → theory). See also → praxis.

2b) Way of doing something that is common or habitual.

2c) Frequent or systematic repetition in doing something.

Etymology (EN): M.E. practisen, practizen;
O.Fr. practiser “to practice,” from M.L. practicare “to do, perform,” from L.L. practicus “practical,” from Gk. praktikos “practical.”

Etymology (PE): 1) Varzidan “to practice, perform; to accustom oneself to; to labor; to sow a field;” Mid.Pers. warz- “to work, do, practice;” Av. varəz- “to work, do, perform, exercise;” cf. Gk. ergon “work;” Arm. gorc “work;” Lith. verziu “tie, fasten, squeeze,” vargas “need, distress;” Goth. waurkjan; O.E. wyrcan “work,” wrecan “to drive, hunt, pursue;” E. work;
PIE base *werg- “to work.”

2. varzé, noun from present stem varz- + suffix -é.