What does "roundtrip" mean?

Native speaker’s answer
Rebecca
"Roundtrip" refers to a full journey to and back from somewhere. For example, a roundtrip ticket for Honolulu means a ticket to go and come back from Honolulu. A related expression is one-way, which refers to only one leg of a journey - to or from somewhere, but not both. Ex: I just bought a roundtrip ticket to Paris. Ex: Are these roundtrip tickets or one-way tickets?