TRAIN

Verb

train (third-person singular simple present trains, present participle training, simple past and past participle trained)

1. (intransitive) To practice an ability.

She trained seven hours a day to prepare for the Olympics.

2. (transitive) To teach and form (someone) by practice; to educate (someone). quotations ▲

You can't train a pig to write poetry.

3. (intransitive) To improve one's fitness.

I trained with weights all winter.

4. (intransitive) To proceed in sequence.
5. (transitive) To move (a gun) laterally so that it points in a different direction.

The assassin had trained his gun on the minister.

6. (transitive, horticulture) To encourage (a plant or branch) to grow in a particular direction or shape, usually by pruning and bending. quotations ▲

The vine had been trained over the pergola.

• • 1805, Francis Jeffrey, The Edinburgh Review:

He trains the young branches to the right hand or to the left.

7. (transitive, machine learning) To feed data into an algorithm, usually based on a neural network, to create a machine learning model that can perform some task. quotations ▲
   • 2023 July 15, Sheera Frenkel, Stuart A. Thompson, “‘Not for Machines to Harvest’: Data Revolts Break Out Against A.I.”, in The New York Times‎^[6], →ISSN:

At least 10 lawsuits have been filed this year against A.I. companies, accusing them of training their systems on artists’ creative work without consent.

8. (transitive, mining) To trace (a lode or any mineral appearance) to its head.