Monoamory refers to the practice of having just one romantic lover during a period of time. The term literally means one lover.
More About Monoamory
Monoamory is a contrast to polyamory, which refers to the practice of having several lovers, or sexual partners at the same time. Monoamory is distinct from monogamy in that it is a different level of relationship. One can be in a monoamourous relationship without being in a monogamous relationship, as one requires marriage.