longitudinally
🇺🇸
/ˌlɑːndʒəˈtuːdənəli/
🇬🇧
/ˌlɒŋɡɪˈtjuːdənəli/
In a lengthwise direction, from one end to the other.
The doctor made a longitudinal incision during the surgery.
Following the sequence of development over time.
The research team has been observing the patients longitudinally for five years.
In relation to longitude or east-west position.
The Prime Meridian is the reference line for all longitudinal measurements.