difference between right away, immediately, and at once

at once - (үтэр түргэн, нэн даруй) immediately; without delay

• Come here at once!

immediately - (нэн даруй)without delay --- synonym at once

• She answered almost immediately.

right away - (дариухан, дор нь) immediately; without delay

• I want it sent right away.

difference between immediately,

 at once, right away, and

 in a minute

• At once, immediately, and right away do not describe a short time. Instead, they indicate that no time at all will elapse(урсан, болж өнгөрөх) before the action considered (although "at once" and "immediately" are stronger, and suggest more urgency(зайлшгүй шаардлагатай).) "In a minute", however, says that a short time will elapse before the event considered takes place; it therefore does not mean the same thing as the other three phrases

• Right away, at once and immediately all mean the same, in a minute means in a minute! (i.e a little bit later than the other 3)

• Effectively 'right away', 'at once' and 'immediately' all the same thing - technically they mean that that no time will elapse before the action is undertaken, however, this is physically impossible, so just think of it as a very short amount of time.
  
  'Just a minute' or 'in a minute' is quantitative - so it means the action will be undertaken in about a minute, just as 'in twenty minutes' means that the action will be undertaken in twenty minutes, or thereabouts.