contraceptive /ˈkɒn.tɹəˌsɛp.tɪv/adjective 1noun 1forms 3 adjective1 •That acts to prevent conception as a result of sexual intercourse.She was careful to take her contraceptive pill at the same time every day. noun1 •A mechanism or means by which conception as a result of sexual intercourse can be prevented or made less likely.Putting a pig's bladder over one's penis before intercourse is not a good contraceptive. formscontraceptives · more contraceptive · most contraceptive