This is the 552nd most frequent Lithuanian word.
kitomis
"Kitomis" means "other" (feminine, plural, instrumental case) in English.
In this context, 'kitomis' refers to 'other' in reference to the classmates, demonstrating its usage as an instrumental plural form.
Jis dalinosi istorijomis su kitomis klasės draugėmis.
He shared stories with other classmates.
Here, 'kitomis' specifies 'other' in regard to groups, again acting as an instrumental plural form.
Per poilsį mokiniai kalbėjosi su kitomis grupėmis.
During the break, the students talked with other groups.
'Kitomis' is used instrumentally here to indicate association with 'other teams'.