Could you please explain what the difference in usage is between through and via, which sounds like a Latinism?
Are they completely interchangeable?
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Using via as a preposition in English is of comparatively recent provenance. It has substantially fewer primary senses, and therefore available uses, than does through. The OED gives only two main senses for via as a preposition, which I include here with a few of each one’s later citations:
- By way of; by the route which passes through or over (a specified place).
- 1958 A. Sillitoe Saturday Night & Sunday Morning iv. 60 — Arthur and his father walked via the scullery into the living-room.
- 1959 M. Gilbert Blood & Judgement xiii. 138 — More··had come to the Police via the Lower Deck of the Royal Navy.
- 1981 G. Household Summon Bright Water iii. 149 — He led me to talk of my interest in ancient economies and thus, via agriculture in the Forest of Dean, eased the way to my impressions of Broom Lodge.
- By means of, with the aid of.
- 1972 M. Kaye Lively Game of Death (1974) vii. 41 — Any deal··would have to be··concluded via contracts, attorneys, the whole schmeer.
- 1977 Rep. Comm. Future of Broadcasting iv. 30 — It would in theory be possible to provide five more services with national coverage via satellite.
Here are some examples of through (taken from the OED’s citation list for that preposition) where you could not substitute in via in its stead:
- 1847 Tennyson Princess iv. 554 - Thy voice is heard thro’ rolling drums.
- 1848 Thackeray Van. Fair xxxii, — George··was lying··dead, with a bullet through his heart.
- 1852 R. S. Surtees Sponge’s Sp. Tour (1893) 85 — He was small and wiry, with legs that a pig could run through.
- 1886 Ad. Sergeant No Saint I. vi. 105 — An old land surveyor··put him through a long catechism.
- 1896 T. F. Tout Edw. I, iv. 80 — All through his reign, the Lusignans helped him in Gascony.
- 1903 Times 14 Mar. 14/5 — The Oxonians showed good form through choppy water.
- 1975 Nature 10 Apr. 501/2 — Nine recognised glaze types, ranging in colour from pale blue, through green, to yellow, brown and red.
- 1981 L. Deighton XPD xliii. 342 - A··notice stating that deliveries were only accepted between eight and eleven Monday through Friday.
- Mod. — There is a path through the wood.
- Mod. — It has passed through many hands since then.
In contrast, in these examples from the same source, one perhaps might be able to make that swap:
- 1852 Dickens Bleak Ho. viii, — Mrs. Pardiggle··had been regarding him through her spectacles.
- 1885 Act 48 & 49 Vict. c. 53 §15 — Every notice··sent through the post in a prepaid registered letter.
- 1894 J. J. Fowler Adamnan Introd. 56 — The southern Picts··embraced the truth through the preaching of St. Ninian.
So even though though there are a few places where you can use via or through — or else via and by — interchangeably as prepositions, there are many others where you cannot.
Finally, it should be noted that there are substantive, adjectival, and adverbial uses of both words, and that these non-prepositional uses are never interchangeable.
tchrist's answer says it all about the definitions of these words.
On the matter of usage, I'm sorry to see via being used in place of through more and more. I put it down to a desire to appear educated and sophisticated, but it backfires, and comes across as pretentious or betrays a lack of care in using the language.
Via has a well established usage meaning to go from one geographical location to another by way of a third. That's how the Romans used it. More recently it was reserved for travel contexts and remains useful in this sense, for example a Northern line train (on the London Underground) going to Morden via Bank.
But for all other uses, through will do perfectly well. It sounds more fitting in our Anglo Saxon tongue and it's shorter (in terms of syllable count) so easier to say, hear and process in the brain. Look at tchrist's last set of quotes that might allow via to substitute for through: in none of them would the substitution improve the flow or clarity or aesthetics of the sentence.
The preposition ‘through’ is often used in sentences when something is going in from one side /end and coming out of another end. Example. The plane went through the clouds.
The preposition ‘via’ is used in sentences when we are talking about a path that passes through. Example . to fly to America via India.
Some of the examples of ‘ through’ are:-
- The train went ‘through’ the tunnel.
- The needle passes ‘through’ the cloth.
Some of the examples of ‘ via’ are:-
- We can take a solution ‘via’ injury.
- Please complete the Paytm ‘via’ PatTm.