substitution
noun [ C or U ]
uk/ˌsʌbstɪˈtjuːʃən/ usthe act of using something new or different instead of something else, or the new thing that is used:
the substitution of sth (for sth) The government plans to encourage the substitution of cheap generic drugs for expensive brand-name ones.
Telecommuting is not a substitution for child care.
See also
product substitution