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active transport
noun
: the movement of a chemical substance by the expenditure of energy against a gradient in concentration or in electrical potential across a plasma membrane compare passive transport
Examples of active transport in a Sentence
Recent Examples on the Web
This may partly account for why, even in Luton, one-fifth of the children studied switched from car-based to active transport during the study period.
—Christine Ro, Forbes, 6 Sep. 2024
Compared to the baseline, 42% of the central London children switched from car-riding to active transport (walking, cycling, scootering, and/or using public transport).
—Christine Ro, Forbes, 6 Sep. 2024
In Luton, 21% of the children transitioned to passive transport, so that essentially there was no change in rates of active transport.
—Christine Ro, Forbes, 6 Sep. 2024
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'active transport.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Word History
First Known Use
1922, in the meaning defined above
Dictionary Entries Near active transport
Cite this Entry
“Active transport.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/active%20transport. Accessed 3 Nov. 2024.
Kids Definition
active transport
noun
: the movement (as across a cell membrane) of substances from regions of lower concentration to regions of higher concentration by the use of energy
Medical Definition
active transport
noun
: movement of a chemical substance by the expenditure of energy against a gradient in concentration or electrical potential across a plasma membrane
More from Merriam-Webster on active transport
Britannica.com: Encyclopedia article about active transport
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