Definition of sub sigillo in English:

sub sigillo

adverb

  • ‘Under the seal’; in confidence, in secret; privately. Also as adjective: confidential, secret.

Origin

Early 17th century. From post-classical Latin sub sigillo from classical Latin sub + sigillō, ablative of sigillum.

Pronunciation

sub sigillo

/ˌsʌb sɪˈdʒɪləʊ//ˌsʌb sɪˈɡɪləʊ/