"Up and down" is vertical.
Side to side (or across) is horizontal.
An easy way to remember this is "horizontal" runs like the horizon.
The vertical measurment is usually referred to as the height.
The length would be the horizontal measurement.
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Length and width define two dimensions, like a piece of paper has a length distance measure along one side and a width distance measure on the other side. In three dimensions there is length and width and height, like a solid brick or block
Synonyms- length
This is the length of time that an animal is pregnant for.
Probably that refers to expressing length in standard (metric) units, like meters, millimeters, and kilometers, instead of some non-standard (non-metric) unit like feet, or light-years.
Length: how long or far something is, like a piece of rope or a walk to the storeArea: how much territory something covers, like a rug or a gardenVolume: how much space something holds or fills, like a bottle, a box, or a balloon