1 Usually, inquire into. search, investigate, probe, examine, research, look into, inspect, study, explore, survey, scrutinize:
Scientists are inquiring into the causes of the greenhouse effect.
1 enquiry, investigation, probe, examination, research, search, inspection, study, exploration, survey, scrutiny, inquest; questioning, querying, interrogation, inquest, cross-examination, inquisition:
The police have asked me to help them with their inquiry. They are conducting an inquiry into the cause of the accident
2 enquiry, question, query, interrogation:
Would you please repeat the inquiry?