Double
Literally 'two times'. Use this when you mean 'twice'.
Use this structure for comparisons, meaning 'double the amount of...'.
Means 'times two'. Used when ordering quantities or in simple math.
I want a double hamburger, please.
My room is 22 ('double two').
I need double the time to finish.
I check my email twice (two times) a day.
The word 'doble' is universal and understood everywhere. There are no significant regional differences in its primary meaning across Latin America or Spain.
'Doble' is commonly used when ordering food, like 'tacos con tortilla doble' (tacos with a double tortilla).
You might hear 'doble' used for emphasis in food, such as 'una milanesa doble' to mean an extra-large breaded cutlet.
'Doble' is standard. For a 'double room' in a hotel, 'habitación doble' is the universal term.
Saying 'Quiero doble cafés' to order two coffees. — Say 'Quiero dos cafés'. 'Doble' is an adjective that describes one thing (like a 'double' espresso shot in one cup), while 'dos' is a number used to count multiple separate items.
Confusing 'pagar doble' and 'pagar dos veces'. — 'Pagar doble' means to pay double the price. 'Pagar dos veces' means to pay on two separate occasions. They are not interchangeable.
Pronouncing it like the English word 'double' ('DUB-ull'). — The Spanish pronunciation is crisp and has two clear syllables: 'DOH-bleh'. The 'e' at the end sounds like the 'e' in 'pet'.