Meditation
No universally accepted definition for meditation

Meditation has proven difficult to define as it covers a wide range of dissimilar practices in different traditions and cultures. In popular usage, the word "meditation" and the phrase "meditative practice" are often used imprecisely to designate practices found across many cultures. These can include almost anything that is claimed to train the attention of mind or to teach calmness or compassion. There remains no definition of necessary and sufficient criteria for meditation that has achieved widespread acceptance within the modern scientific community.
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