Definition of "if only" [if only]

• I wish that; signifies a wish or desire for the present or the future. (phrase)
• I wish that; signifies a regret about an action in the past. (phrase)

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• "Ella Mental by Amber Deckers if only every girl had a “Good Sense” guide!"
• "Another image, AS11-40-5894, would have provided a good view of Armstrong at the MESA, if only the exposure would have been more appropriate."
• "From Paestum, the road to Brundisium led through Caposele another reason to identify it with the place towards the Peteline Mountains, if only military history were neat and logical."