There are multiple definitions:

1. external cephalic version(English)

   • should form part of a range of options provided to women, rather than a default procedure for management of the term breech. For motivated women who fit the safe criteria for vaginal breech birth, not being subjected to a painful experience (ECV) may be optimal. Women should be supported to access services that support vaginal breech birth if this is their choice, and continuity of care should be standard practice
   • VB
   • Obstetrics
   • https://doi.org…2884-016-1038-1

2. explained common variance(English)

   • SPS
   • Statistics
   • https://doi.org…psyg.2017.00070

3. extracellular volume(English)

   • refers to the space or volume of a tissue that is not occupied by cells
   • MOLLI, MRI
   • Physiology, Medical imaging
   • https://doi.org…2968-016-0308-4

4. epidemiological cutoff value(English)

   • CA, CBP, CLSI
   • Epidemiology, Clinical chemistry, Standards
   • https://doi.org…bio.2013.05.019

5. electrical cardioversion(English)

   • sinus rhythm restoration in case of atrium fibrillation
   • AF, CCV, DCCV, ivCCV, oCCV, SR
   • Cardiology, Electrophysiology, Therapeutic approaches
   • https://doi.org…europace/eur406

6. extracellular volume [fraction](English)

   • the fractional volume of water outside of cells in relation to the volume of water inside of cells in myocardial tissue. An increased ECV value indicates the presence of excessive collagen deposition or fibrosis, such as in amyloidosis or myocardial infarction. The calculated value (%) depends on hematocrit, post-contrast T1 and native T1, measured both for blood and myocardium
   • HFsnEF, CMR, LGE, LVEF
   • Cardiology, Medical imaging, Ratio-based metric
   • https://doi.org…55/2022/3094933
   • https://doi.org…2968-016-0308-4