(countable) day (24-hour period) / (countable) day (period from midnight to the following midnight) / (countable, astronomy) day (rotational period of a planet, moon or any celestial body (especially Earth)) / (countable) day, daylight (period between sunrise and sunset when there is daylight) / (uncountable) day, daylight, light (light from the Sun) / (uncountable, figurative) light (open view; a visible state or condition) / (uncountable) day (part of a day which one spends at work, school, etc.) / (uncountable, figurative) day (specified time or period, considered with reference to the prominence or success (in life or in an an argument or conflict) of a person or thing) / (countable, dated, now found chiefly in compounds such as Bundestag, Reichstag, Landtag, Sudetendeutscher Tag or Tag der Oberschlesier) convention, congress (formal assembly)