longitudinally
longitudinally — adverb
1. Describing a method of study where the same people are watched or tested repeate
Describing a method of study where the same people are watched or tested repeatedly over many months or years to see how they change.
The research team followed the same group of children longitudinally for twelve years.
adverb modifying 'followed' — typical research context
Scientists studied the patients longitudinally, checking their health at five-year intervals.
Kofi's development was tracked longitudinally from the age of three until he began university.
The university studied its graduates longitudinally to measure how their careers progressed.
- over time
less formal, not specific to research methodology
- repeatedly
does not imply a long period — only that something happens more than once
- prospectively
more technical; refers specifically to forward-looking study design
- cross-sectionally
describes studying different subjects at one point in time rather than the same subjects over time
文法句型
modifies verb phrase describing research methodology
modifies a clause describing repeated observation
用法筆記
Common in academic writing, especially in psychology, medicine, and social sciences. The noun phrase 'longitudinal study' is more frequent than the adverb in everyday use.
常見錯誤
2. In the direction that runs from the head end to the foot end of a living body, o
In the direction that runs from the head end to the foot end of a living body, or along the longer dimension of a body part.
The surgeon cut the muscle longitudinally to avoid damaging the surrounding tissue.
modifying 'cut' — surgical/anatomical context
Nadia's spine was measured longitudinally from her neck down to her lower back.
Doctors examined the artery longitudinally and found a blockage along its full length.
The bone was split longitudinally so that the students could study its inner structure.
- lengthwise
less formal; used in everyday contexts rather than medical writing
- from head to tail
descriptive phrase; less technical, used mainly for animals
- transversely
describes cutting or measuring across the short dimension
- cross-sectionally
describes examining across the width rather than along the length
文法句型
modifies a verb describing cutting, measuring, or examining a body part
用法筆記
Often paired with verbs of cutting ('cut', 'slice', 'split') or examining ('examine', 'scan', 'measure'). Contrasts with 'transversely' or 'cross-sectionally', which refer to cutting across the short dimension.
常見錯誤
3. In a way that follows the greatest measurement of an object, going along its mai
In a way that follows the greatest measurement of an object, going along its main length rather than across its width.
Hamza sliced the cucumber longitudinally into four thin strips for the salad.
modifying 'sliced' — everyday kitchen context
The carpenter cut the wooden board longitudinally right down the middle.
The garden path runs longitudinally from the front gate to the back of the house.
Mira arranged the tiles longitudinally along the longest wall of the bathroom.
- lengthwise
more common in everyday English; less formal
- from end to end
descriptive phrase; works for both objects and spaces
文法句型
modifies a verb describing cutting, positioning, or arranging an object
用法筆記
More general than sense 2 (ALONG THE BODY), which is specific to anatomy. This sense applies to any physical object. In everyday speech, 'lengthwise' is far more common.
常見錯誤
4. Measured, positioned, or expressed in terms of the east-west coordinate lines on
Measured, positioned, or expressed in terms of the east-west coordinate lines on a map or globe, rather than the north-south lines of latitude.
The country stretches longitudinally for nearly two thousand kilometres from east to west.
modifying 'stretches' — geographic measurement
The two islands are separated longitudinally by about three degrees of longitude.
Scientists measured the earthquake's position both longitudinally and by latitude.
The desert extends longitudinally along the same line of longitude for hundreds of kilometres.
- by longitude
equivalent meaning; 'by' prepositional phrase is less formal
- in terms of longitude
explanatory; more verbose but clear for learners
- latitudinally
refers to the north-south coordinate system rather than east-west
文法句型
modifies a verb describing measurement, position, or extent on the globe
用法筆記
Almost always used together with terms for latitude when describing location. The paired phrase 'longitudinally and latitudinally' is common in geographic writing.