Tra từ far - Từ điển Oxford Advanced Learner 8th

far [far further farther furthest farthest] adverb, adjective BrE [fɑː(r)] NAmE [fɑːr]
adverb (far·ther, far·thestor fur·ther, fur·thest)

DISTANCE
1. a long distance away
• We didn't go far.
• Have you come far?
•It's not far to the beach.
•There's not far to go now.
•~ (from, away, below, etc.) The restaurant is not far from here.
•countries as far apart as Japan and Brazil
•He looked down at the traffic far below.
•Far away in the distance, a train whistled.
•The farther north they went, the colder it became.
•a concert of music from near and far In positive sentences it is more usual to use a long way
•We went a long way.
•We went far.
•The restaurant is a long way from here.
2. used when you are asking or talking about the distance between two places or the distance that has been travelled or is to be travelled
• How far is it to your house from here?
• How far is Boston from New York?
•How much further is it?
•We'll go by train as far as London, and then take a bus.
•We didn't go as far as the others.
•I'm not sure I can walk so far.

TIME
3. a long time from the present; for a large part of a particular period of time
•~ back The band made their first record as far back as 1990.
• To answer that question we need to go further back in time.
•~ ahead Let's try to plan further ahead.
•~ into sth We worked far into the night.

DEGREE
4. very much; to a great degree
• That's a far better idea.
• There are far more opportunities for young people than there used to be.
•It had been a success far beyond their expectations.
•He's fallen far behind in his work.
•She always gives us far too much homework.
5. used when you are asking or talking about the degree to which sth is true or possible
• How far can we trust him?
• His parents supported him as far as they could.
•Plan your route in advance, using main roads as far as possible.

PROGRESS
6. used to talk about how much progress has been made in doing or achieving sth
• How far have you got with that report?
• Half an hour later Duncan was no farther in his quest.
•I read as far as the third chapter.
•We've got as far as collecting our data but we haven't analysed it yet.
more at far/farther/further afield at ↑afield, few and far between at ↑few _adj., so near and yet so far at ↑near _adv.

Word Origin:
Old English feorr, of Germanic origin; related to Dutch ver, from an Indo-European root shared by Sanskrit para and Greek pera ‘further’.

Which Word?:
farther / further / farthest / furthest
These are the comparative and superlative forms of far.
To talk about distance, use either farther, farthest or further, furthest. In BrE, further, furthest are the most common forms and in NAmE, further and farthest: ▪ I have to travel further/farther to work now.
To talk about the degree or extent of something, further/furthest are usually preferred: ▪ Let’s consider this point further.
Further, but not farther, can also mean ‘more’ or ‘additional’: ▪ Are there any further questions? This sounds very formal in NAmE.
Idioms: ↑as far as I am concerned ▪ as far as I can remember/see/tell ▪ ↑as far as I know ▪ ↑as far as it goes ▪ ↑as far as somebody goes ▪ ↑as far as somebody is concerned ▪ ↑as far as the eye can see ▪ ↑by far ▪ ↑far and away ▪ ↑far and wide ▪ ↑far be it from me to do something ▪ ↑far cry from something ▪ ↑far from from doing something ▪ ↑far from it ▪ ↑go far ▪ ↑go far enough ▪ ↑go so far as to … ▪ ↑go this far ▪ ↑go too far ▪ ↑in so far as ▪ ↑not far off ▪ ↑not go far ▪ ↑so far ▪ ↑so far, so good ▪ ↑take something too far ▪ ↑thus far

adjective (far·ther, far·thestor fur·ther, fur·thest)only before noun

DISTANT
1. at a greater distance away from you
• I saw her on the far side of the road.
•at the far end of the room
• They made for an empty table in the far corner.
2. at the furthest point in a particular direction
•the far north of Scotland
• Who is that on the far left of the photograph?
• She is on the far right of the party (= holds extreme ↑right-wing political views).
3. (old-fashioned or literary)a long distance away
•a far country
• Somewhere in the far regions of her mind a voice was screaming warnings.

Word Origin:
Old English feorr, of Germanic origin; related to Dutch ver, from an Indo-European root shared by Sanskrit para and Greek pera ‘further’.