What is the meaning of Speculare?

mirror; specular

to speculate [with su ‘about’] [auxiliary avere]

to speculate [with su ‘on’] [auxiliary avere]

to profit from, to take advantage of, to exploit [with su] [auxiliary avere]

to inquire philosophically into, to investigate philosophically, to speculate about (a subject)

second-person singular present active imperative/indicative of speculor

speculation

Source: wiktionary.org