How Do You Spell PIONED?
Pronunciation: [pɪˈɒnd] (IPA) 
The word "Pioned" is an obsolete form of the verb "pioneered". It is pronounced as /piˈəʊnid/. The use of "ie" instead of "ee" in the second syllable is because of the classic English pronunciation of the letter "o" in the Old English root word "pionere". The spelling "pionere" was later changed to "pioneer" with "ee" as English language underwent significant changes. "Pioned" is rarely used in modern English and is considered an archaic spelling.
