The Lemma command returns a canonical form of the given word based on the meaning of the word.  

If a lemma is not known for the given word then that word is returned unchanged.  

This function is part of the EssayTools package, so it can be used in the short form Lemma(..) only after executing the command with(EssayTools). However, it can always be accessed through the long form of the command by using EssayTools[Lemma](..).

$\mathrm{with}\left(\mathrm{EssayTools}\right)\:$

$\mathrm{Lemma}\left(''did''\right)$

$''do''$

$\mathrm{Lemma}\left(''am''\right)$

$''be''$

$\mathrm{Lemma}\left(''loved''\right)$

$''love''$

The EssayTools[Lemma] command was introduced in Maple 17.

For more information on Maple 17 changes, see Updates in Maple 17.