third order

noun, often capitalized T&O

Definition of third order

1 : an organization composed of lay people living in secular society under a religious rule and directed by a religious order
2 : a congregation especially of teaching or nursing sisters affiliated with a religious order

First Known Use of third order

1629, in the meaning defined at sense 1

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The first known use of third order was in 1629

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a complex dispute or argument

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