seniorchild
nounUK /ˈsiːniə tʃaɪld/
US /ˈsiːnjər tʃaɪld/
A senior child is the older kid in a family.
As the seniorchild, Maya got to pick the movie for family night.
RELATED WORDS
OTHER MEANINGS
2. The child who has been in a school or club the longest.
The seniorchild in the art club showed the new members where to find the paints.
3. A child given extra duties because they are the oldest.
The seniorchild helped the little ones tie their shoes before the trip.
4. The older of two children compared with each other.
Compared with his baby sister, Leo is the seniorchild in the house.