Why ‘an’ in front of an ‘h’-word?
I have often come across cases where the rule that you only put ‘an’ in front of a word starting with a vowel seems to have been violated, as e. g. in:
“What’s needed is (a) conclusive research and (b) an holistic approach to changing the nation’s dietary habits”.
I have also seen “an historic event”. Can someone enlighten me as to what’s happening here?