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When talking strictly about knowledge rather than practical skill, the term "authority"authority would seem the right oneterm, implyingbecause it implies that the person'sperson’s level of expertise is not only very high but also widely recognised as such.

When talking strictly about knowledge rather than practical skill, the term "authority" would seem the right one, implying that the person's level of expertise is not only very high but widely recognised as such.

When talking strictly about knowledge rather than practical skill, authority would seem the right term, because it implies that the person’s level of expertise is not only very high but also widely recognised as such.

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When talking strictly about knowledge rather than practical skill, the term "authority" would seem the right one, implying that the person's level of expertise is not only very high but widely recognised as such.