Further, according to the Oxford Dictionary of English, the word dilution means a degree of dilute. Given as example" " An antidote was administered at dilution 1:50" My understanding is, in English usage, a dilution of 1:50 means the concentration of the final solution is only 1:50 or 1/50 of the original.(posted 8474 days ago)Further, 1 ml of the dilution, has a strength of only 1/50 of the original antidote.
From liguistic standpoint, the correct interpretation of "dilute 1:3" is dilute to a RATIO OF 1:3 Not dilute to 1+3.