uptake

up•take n.

understanding or comprehension;
mental grasp:[uncountable]quick on the uptake.
[countable] an act or instance of taking up.
Mechanical Engineering[countable] a flue leading upward from below, such as for conducting smoke or a current of air.
[uncountable] the absorption of substances, as nutrients, by the tissues of the body.

up•take n.

apprehension;
understanding or comprehension;
mental grasp:quick on the uptake.
an act or instance of taking up;
a lifting:the uptake of fertilizer by machines.
Mechanical EngineeringAlso called take-up. [Mach.]a pipe or passage leading upward from below, as for conducting smoke or a current of air.
[Physiol.]absorption.

Collins Concise English Dictionary © HarperCollins Publishers::

uptake /ˈʌpˌteɪk/ n

a pipe, shaft, etc, that is used to convey smoke or gases, esp one that connects a furnace to a chimney
another term for upcast
taking up or lifting up
the act of accepting or taking up something on offer or available
quick on the uptake ⇒ informal quick to understand or learn
slow on the uptake ⇒ informal slow to understand or learn

'uptake' also found in these entries (note: many are not synonyms or translations):

Collocations: [glucose, vitamin, nutrient] uptake, the uptake of [glucose], the uptake of [smoking, vaccinations, new technology], more...

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