longitudinal

From Middle English longitudinal, from Latin longitūdin-, oblique stem of longitūdō (“length, longitude”), equivalent to longitude +‎ -al.

• (Received Pronunciation) IPA^(key): /ˌlɒŋɡɪˈtjuːdɪnl/
• (General American) IPA^(key): /ˌlɑndʒəˈtuːdənəl/
• (General Australian) IPA^(key): /lɔŋɡəˈt͡ʃʉːdənəl/

longitudinal (not comparable)

1. Relating to length, or to longitude.
   1. (Can we add an example for this sense?)
2. Running in the direction of the long axis of a body.
3. Forward and/or backward, relative to some defined direction.
4. (sciences and social sciences, of a study) Sampling data over time rather than merely once.

• (relating to length): transverse
• (sampling data over time): cross-sectional

longitudinal (plural longitudinals)

1. Any longitudinal piece, as in shipbuilding etc.
   1. A railway sleeper lying parallel with the rail.

longitudinal (feminine singular longitudinale, masculine plural longitudinaux, feminine plural longitudinales)

1. longitudinal

• IPA^(key): /lonxitudiˈnal/, [lõŋxit̪uðiˈnal]

longitudinal (plural longitudinales)

1. longitudinal (relating to length or longitude)
2. longitudinal (sampling data over time)
   • 2001, Psicología infantil, Grupo Planeta (GBS) →ISBN, page 80

     El número de años que requiere un estudio longitudinal puede variar considerablemente.

     The number of years required by a longitudinal study may vary considerably.

• longitud
• longitudinalmente

• “longitudinal” in Diccionario de la lengua española, Vigésima tercera edición, Real Academia Española, 2014.