The base form, 'walk', that one might look up in a dictionary, is called the lemma for the word.

The base form is used in the following ways:

This name applies to the base martial form of the dance.

This enables them, especially Filipino, to form new words from simple base forms.

The verbs are generally reduced to two base forms, one for the present, another for the past.

It is unknown if she can do this in forms other than her base form.

An infinitive phrase begins with the base form of the verb.

Whether or not a cloud is low, middle, or high level depends on how far above the ground its base forms.

A word from which others are derived; courage is the base form of courageous.

When the base form is a polygon that tiles the plane, rule 1 may be broken.