vary between (someone or something)
1. To alternate between two or more different options, choices, or possibilities. I keep varying between graphite and ink for my drawings. The senator keeps varying between wildly different tones during his campaign—one moment he's making tearful emotional appeals, and the next he's spewing the most hateful vitriol against his opponents.
2. To alternate or fluctuate between two or more different states or conditions. The weather around here varies between cloudy and rainy—not a lot of sun in these parts.
3. To change or differ between two or more people, things, or groups. Reception of the proposed legislation has varied between demographics but has largely been positive. Specific laws will vary between one country and another, so you'll want to look into it before your trip across Europe this summer.
vary between (someone and someone else)and vary between something and something else
to fluctuate in choosing between people or things. In choosing a bridge partner, Sam varied between Tom and Wally. I varied between chocolate and vanilla cake for dessert.
vary between (something and something else)
to fluctuate between one thing and another. The daytime temperatures vary between 80 and 90 degrees. She varies between angry and happy.