explanatory 90
purposes . The experimental aircraft were used to investigate high-speed flight.
explanatory /.kspln.t(.)ri/ adjec-tive referring to something which explains . explanatory paragraph a paragraph of text which explains some-thing . self-explanatory something which does not need any further expla-nation
explosion /.kspl.υ(.)n/ noun 1. a
release of energy in a sudden and often violent way . an explosion caused by a bomb 2. an act of bursting as a result of internal pressure . tyre explosion due to overheating 3. the loud sound made as a result of an explosion . The passen-gers heard an explosion.
explosive /.kspl.υs.v/ adjective
referring to something having the nature of an explosion . an explosive effect having the effect of an explosion
. noun a substance, especially a pre-pared chemical, that explodes or causes explosions, e.g. Semtex
expose /.ksp.υz/ verb to uncover something or leave something uncov-ered so that it is not protected from something such as rain or sunlight .
When the slope of a hill is exposed to solar radiation, wind currents are set up. . exposed to the sun in sunlight without covering . exposed surface a surface without paint or covering of any sort
exposure /.ksp.υ./ noun 1. the
fact of being exposed, especially to severe weather or other forces of nature
. After 24 hours in the sea, she was suf-fering from the effects of exposure and was taken to hospital. 2. the fact of being subjected to something . Expo-sure to radio-active substances may cause cancer.
express /.kspres/ verb to put into words, symbols or signs . Bearings may be expressed as true or relative. . An angle may be expressed in degrees, minutes and seconds. . Pressure alti-tudes are expressed in hundreds of feet.
extend /.kstend/ verb to stretch or spread from one point to another in space or time . Air from the Gulf of
Mexico can extend into Canada. . Cumulonimbus clouds may extend to over 50,000 ft. . to extend the dura-tion of something to prolong the time .
The visit was extended to allow time for more discussions.
extensive /.kstens.v/ adjective
large in range or amount . an extensive area a large area . extensive cloud a lot of cloud . extensive use is made of much use is made of
extent /.kstent/ noun a range or amount of something . The horizontal extent of the cloud averages about 50 km. . Clouds of great vertical extent are not uncommon. . to a certain extent, to some extent partly . The accident was caused, to a certain extent, by the poor weather. . to a lesser extent not as much as something previously stated .
The cloud types which are most likely to affect flying conditions in terms of icing, precipitation and turbulence are cumulus, cumulonimbus and, to a lesser extent, nimbostratus.