be owned by; be in the possession of; "This book belongs to me"
be classified with; "The whales belong among the mammals"
be suitable or acceptable; "This student somehow doesn't belong"
be in the right place or situation; "Where do these books belong?"; "Let's put health care where it belongs--under the control of the government"; "Where do these books go?"
to believe especially on uncertain or tentative grounds; "Scientists supposed that large dinosaurs lived in swamps"
talk over conjecturally, or review in an idle or casual way and with an element of doubt or without sufficient reason to reach a conclusion; "We were speculating whether the President had to resign after the scandal"
invest at a risk; "I bought this house not because I want to live in it but to sell it later at a good price, so I am speculating"