to practice
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to practice
To work in a particular profession, especially an independent profession such as that of a doctor, dentist, or lawyer.
Dr. Schmidt praktiziert seit zehn Jahren als Allgemeinarzt in einer kleinen Landpraxis.
Dr. Schmidt has been practicing as a general practitioner in a small rural practice for ten years.
The verb 'praktizieren' (to practice) belongs to the word family of 'die Praxis' (practice, e.g. doctor's office) and 'praktisch' (practical). All of these words refer to the actual execution or application of something.
Seine Praxis befindet sich im Stadtzentrum.
His practice is located in the city center.
When 'praktizieren' (to practice) means to work in a profession, it is usually followed by the preposition 'als' (as) with the job title. This is typical for doctors, lawyers, and other independent professions.
Sie praktiziert seit fünf Jahren als Rechtsanwältin.
She has been practicing as a lawyer for five years.
When it is about applying a technique or habit, 'praktizieren' (to practice) is used with a direct object in the accusative. So you practice 'something'.
Er praktiziert jeden Morgen Yoga, um fit zu bleiben.
He practices yoga every morning to stay fit.
Similar to a technique, 'praktizieren' (to practice) can also be used with an abstract concept in the accusative. It then means to actively live out this idea in everyday life.
Sie versucht, im Alltag mehr Geduld zu praktizieren.
She tries to practice more patience in everyday life.
to operate / pursue
'betreiben' and 'praktizieren' can both describe doing something regularly. 'betreiben' fits especially with activities, hobbies, or sports that you actively do. 'praktizieren' is used more when you apply a technique, habit, idea, or belief in everyday life. It often sounds somewhat more formal. For example, you 'betreibt' sport, but you 'praktiziert' meditation or a particular way of life.
Anton praktiziert jeden Morgen Atemübungen, weil sie ihm beim Stress helfen.
Anton practices breathing exercises every morning because they help him with stress.
Im Sommer betreibt Max viel Sport im Park.
In summer, Max does a lot of sport in the park.