Definition of "informally" []

• In an irregular or informal manner; without the usual forms. (adverb)

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• "After the meeting, I met privately with Secretary of State Al Haig and told him to call our ambassador in Tokyo, Mike Mansfield, and have him pass the word informally to Japanese Foreign Minister Masa-yoshi Ito, who was scheduled to make a visit to Washington in a few days, that pressure was building in Congress for passage of a bill establishing mandatory quotas."
• "In what is referred to informally as a hereditary republic, Bashar al-Assad has continued the tradition, with his brother and brother-in-law among those holding top positions in the army and intelligence."
• "Whether they can successfully insist on everyone else using that name, formally or informally, is a matter of power relationships."