monogamous
Monogamous (adj) means having only one romantic or sexual partner at a time; committed exclusively to one partner. Example: “They've been in a monogamous relationship for over a decade.”
How to use monogamous
Learner’s notesIn plain EnglishSticking to one partner rather than having multiple partners at once.
Fill the gap
Can you complete this real example?
They've been in a _____ relationship for over a decade.
Etymology
From "mono-" (single) plus "-gamous," from Greek gamos, "marriage."