duct (pipe, tube or canal which carries air or liquid from one place to another)

(university slang) During the attendance check, deceiving a lecturer into thinking another person is in attendance by answering for them.

(university slang) During the attendance check, to deceive a lecturer into thinking another person is in attendance by answering for them.

(formal, literally or figuratively) dirtiness

(formal, literally or figuratively) to be dirty

(obsolete, military) battery

technician, engineer

science and technology

technical

(computing) information technology (the practice of creating and/or studying computer systems and applications)