In the Dimension Search Configuration editor in Developer Studio you can specify that the results of a dimension search return only the highest ancestor dimension value.
For example, if both
red zinfandel
and
red wine
match a search query for
red
and you check
Return Highest Ancestor Dimension, only the
red wine
dimension value is returned (assuming
the
red wine
is the ancestor of
red zinfandel
). If the setting is not checked,
then both dimension values are returned.