(also level ) noun
a glass tube partly filled with liquid, with a bubble of air inside. Spirit levels are used to test whether a surface is level, by the position of the bubble.
(also level ) noun
a glass tube partly filled with liquid, with a bubble of air inside. Spirit levels are used to test whether a surface is level, by the position of the bubble.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005