The word come from the Latin longitudo meaning length. Hence, longitudinal means along the length, running lengthwise, or (by extension) over the course of time.
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1. Running lengthwise; in the direction of the long axis of the body or any of its parts. SYN: longitudinalis [TA]. 2. Studied over a period of time, diachronic; contrast with cross-sectional or synchronic, which give equivalent results only under certain strict conditions of stability and equilibrium. Strict attention to these conditions is of the greatest importance in the study of survivorship either in demographics or in cell economy (such as the survival pattern of the erythrocytes and platelets). [L. longitudo, length]

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lon·gi·tu·di·nal .län-jə-'t(y)üd-ən-əl, -nəl, Brit also .läŋ-gə-'tyüd- adj
1) of, relating to, or occurring in the lengthwise dimension <a \longitudinal bone fracture>
2) extending along or relating to the anteroposterior axis of a body or part <a trypanosome which reproduces by \longitudinal fission>
3) involving the repeated observation or examination of a set of subjects over time with respect to one or more study variables (as general health, the state of a disease, or mortality) <a \longitudinal study of heart transplant recipients over a five-year period>
lon·gi·tu·di·nal·ly adv

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lon·gi·tu·di·nal (lon″jĭ-tooґdi-nəl) [L. longitudo length] lengthwise; parallel to the long axis of the body or an organ.

Medical dictionary. 2011.

Look at other dictionaries:

  • longitudinal — longitudinal, ale, aux [ lɔ̃ʒitydinal, o ] adj. • 1314; du lat. longitudo, inis « longueur » 1 ♦ Qui est dans le sens de la longueur. Des bandes longitudinales et verticales. Vallée longitudinale, qui suit les chaînes de montagne. Coupe, section… …   Encyclopédie Universelle

  • longitudinal — LONGITUDINÁL, Ă, longitudinali, e, adj., s.f. 1. adj. Care este aşezat în direcţia lungimii, care se întinde de a lungul. 2. s.f. Nervură metalică aplicată în sens longitudinal (1) pe fundul unei nave, pe bordaje sau sub punte, pentru a întări… …   Dicționar Român

  • Longitudinal — Lon gi*tu di*nal, a. [Cf. F. longitudinal.] 1. Of or pertaining to longitude or length; as, longitudinal distance. [1913 Webster] 2. Extending in length; in the direction of the length; running lengthwise, as distinguished from {transverse}; as,… …   The Collaborative International Dictionary of English

  • longitudinal — 1. medida en la dirección del eje mayor de un objeto, cuerpo u órgano, como el arco longitudinal del pie. 2. estudio científico que se lleva a cabo en un período de …   Diccionario médico

  • longitudinal — longitudinal, ale (lon ji tu di nal, na l ) adj. 1°   Terme didactique. Qui est étendu en long. Traits longitudinaux. •   Le ventre [des autours] et le dessous de la gorge changent moins, et sont ordinairement blancs ou blancs jaunâtres, avec des …   Dictionnaire de la Langue Française d'Émile Littré

  • longitudinal — adjetivo 1. Que se hace o se coloca en el sentido o en la dirección de la longitud: corte longitudinal …   Diccionario Salamanca de la Lengua Española

  • Longitudinal — Lon gi*tu di*nal, n. A railway sleeper lying parallel with the rail. [1913 Webster] …   The Collaborative International Dictionary of English

  • Longitudināl — (v. lat.), der Länge nach, die Länge betreffend. Daher Longitudinalmagnet, ein länglicher Magnetstab, bei welchem die beiden Pole sich an den am weitesten von einander abstehenden Enden befinden, im Gegensatz zu den Lateralmagneten, bei welchen… …   Pierer's Universal-Lexikon

  • Longitudināl — Longitudināl, der Länge (lat. longitudo) nach, Längs …   Meyers Großes Konversations-Lexikon

  • Longitudinal — Longitudināl (lat.), der Länge nach, die Länge betreffend. Longitudinalschwingungen, s. Wellen …   Kleines Konversations-Lexikon

  • Longitudinal — Longitudinal, lat. deutsch, der Länge nach …   Herders Conversations-Lexikon

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