1. A data field or attribute in a form, database, or software interface that appears without prior warning or documentation
The API returned an unexpected field that wasn't mentioned in the documentation.
A API retornou um campo inesperado que não estava mencionado na documentação.
2. An unforeseen or surprising area of study, research, or professional interest
His career took him into an unexpected field of biotechnology.
Sua carreira o levou para um campo inesperado de biotecnologia.