Tienen is a conjugated for of the verd 'tener', which means 'to have'. Tienen is in the present tense, and it means 'they have'.
Tiene / tienen / tienes / tenéis
All the students have pencils.
"quidera" is not a Spanish word.
Las arañas tienen ocho piernas.
alico is not a Spanish word.
"Los perros tienen" is Spanish for "The dogs have."
it means they have
Tiene / tienen / tienes / tenéis
you guys are intellectual
It means either you [plural] have, or, they have.
"they (females) have boyfriends."
It must be:Los hombres que tienen ropa negra --- men wearing black clothing.
All the students have pencils.
ellos tienen
tienen
"Tienen un bien día" in Spanish means "Have a good day" in English. It is a common greeting to wish someone a pleasant day.
Tienen razón