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 (plē′nə-rē, plĕn′ə-)
1. Complete in all respects; unlimited or full: a diplomat with plenary powers.
2. Fully attended by all qualified members: a plenary session of the council.

[Late Latin plēnārius, from Latin plēnus, full; see pelə- in Indo-European roots.]

ple′na·ri·ly adv.
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Adv.1.plenarily - in a plenary manner; "an empire destined to enter the Commonwealth plenarily"