A sacred word or syllable used as an object of concentration for meditation (6)

I believe the answer is:

mantra

(Other definitions for mantra that I've seen before include "Phrase repeated as aid to meditation in Buddhism" , "it's said to aid concentration" , "Vedic hymn; slogan frequently repeated" , "repeating phrase" , "Aid to concentration (Buddhism,Hinduism)" .)

I've seen this clue in The Independent.

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