1. Infrequent, irregular, or occasional instances of communication that occur at unpredictable intervals
Due to the remote location, they could only maintain sporadic communications with the base camp.
Devido à localização remota, podiam manter apenas comunicações esporádicas com o acampamento base.
2. Disconnected or isolated messages or exchanges that do not form a continuous dialogue
After he moved abroad, they had sporadic communications through letters.
Depois que ele se mudou para o exterior, tiveram comunicações esporádicas através de cartas.