1. In preference.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• prefferibly,
• preferiably,
• prefferrably,
• preferible,
• prefferable,
• prefeably,
• preffereably,
• peferably,
• preferbably,
• preferab,
• prefereabley,
• preverably,
• preferrably,
• preferrbly,
• preverable,
• preferrablly,
• preferbley,
• preferribly,
• prefrably,
• preferrebly

• preferential,
• provera,
• preference,
• proffer,
• Proverbs,
• preferable,
• property,
• proverb,
• preferment,
• preferred,
• properly,
• proverbially,
• proverbial.

The adjective form of the word "preferably" is "preferable".

The plural form of the word "preferably" is "preferably". The word does not change when indicating more than one of something.

The singular form of "preferably" is "preferably". It is an adverb that does not have a distinct singular form.