why doesn't this display as a text area in the admin?

Specifically, why doesn't Definition show up as a text area in /admin:

class DictionAid (models.Model):
Id = models.AutoField(primary_key=True)
Term = models.CharField (max_length=50, blank=False,
db_index=True)
Definition = models.TextField (max_length=1000, blank=False)
DateAdded = models.DateTimeField (auto_now_add=True,
blank=False, db_index=True)

class DictionAidAdmin(admin.ModelAdmin):
list_display = ('Term','DateAdded',)
list_filter = ['DateAdded']
search_fields = ['Term','Definition']

admin.site.register(DictionAid,DictionAidAdmin)

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