I don't know if the following argument will help, and I'm at work so I don't have my PHB with me, but I'm going to try nonetheless.
Query:
Does "Dragon must wait 1 round to do so again" = "One round must elapse from the end of Breath1 to the start of Breath2"? All characters/creatures/etc. automatically "wait" from the end of their initiative action until the start of their next initiative action, given the turn-based nature of D&D combat. Moreover, there is no "wait" action allowed under the rules, so the interpretation that a dragon must spend a round "waiting" de facto requires the dragon to undertake an action that is not allowed under the rules.
Thus, I believe the "equation" above is a logical deduction from the wording of the ability.
If the answer to the above query is yes, then the dragon can breathe in sequential rounds (on a roll of 1).
Definition - One round equals the time elapsed from the end of initiative X in round R to the end of initiative X in round (R+1). I believe this is an accurate statement of the definition of a round (attaching "seconds" to this is not a helpful means of analysis given the 3E system).
Example:
Round 1
Initiative 20 - Dragon breathes
Round 2
Initiative 20 - Dragon delays
Initiative 19 - Dragon breathes
One round elapsed, since the time from the end of initiative X (20) in Round 1 to the end of initiative X (20) in Round 2 has passed. If one round must elapse between breaths to meet the definition of "dragon must wait 1 round between breaths" then the dragon has met the requirement.
Joren the Divider
Query:
Does "Dragon must wait 1 round to do so again" = "One round must elapse from the end of Breath1 to the start of Breath2"? All characters/creatures/etc. automatically "wait" from the end of their initiative action until the start of their next initiative action, given the turn-based nature of D&D combat. Moreover, there is no "wait" action allowed under the rules, so the interpretation that a dragon must spend a round "waiting" de facto requires the dragon to undertake an action that is not allowed under the rules.
Thus, I believe the "equation" above is a logical deduction from the wording of the ability.
If the answer to the above query is yes, then the dragon can breathe in sequential rounds (on a roll of 1).
Definition - One round equals the time elapsed from the end of initiative X in round R to the end of initiative X in round (R+1). I believe this is an accurate statement of the definition of a round (attaching "seconds" to this is not a helpful means of analysis given the 3E system).
Example:
Round 1
Initiative 20 - Dragon breathes
Round 2
Initiative 20 - Dragon delays
Initiative 19 - Dragon breathes
One round elapsed, since the time from the end of initiative X (20) in Round 1 to the end of initiative X (20) in Round 2 has passed. If one round must elapse between breaths to meet the definition of "dragon must wait 1 round between breaths" then the dragon has met the requirement.
Joren the Divider