Definition of "across"

across

/əˈkɹɒs/

preposition
1. To, toward, or from the far side of (something that lies between two points of interest).
2. On the opposite side of (something that lies between two points of interest).
3. (Southern US, African-American Vernacular) across from: on the opposite side, relative to something that lies between, from (a point of interest).
  Quotations
  And make sure you're parked across the mall in the outside lot. […] Last time I was there, I parked in a parking structure and paid an arm and a leg for it.
  1994 June 21, Thong P Tong <tongtp@coyote.cig.mot.com>, "Re: Battle Tech Center", message-ID <2u7lsi$79n@delphinium.cig.mot.com>, comp.sys.ibm.pc.games, Usenet
  On another occasion, Clinton asked Patterson to drive him to Chelsea's school, Booker Elementary, where Clinton met the department store clerk and climbed into her car."I parked across the entrance and stood outside the car looking around, about 120 feet from where they were parked in a lot that was pretty well lit," Patterson recalled. " […] They stayed in the car for thirty to forty minutes."
  1995, Ronald Kessler, Inside the White House, published 1996, page 243
  A boy that sat across me politely introduced himself as Jackson Klausner.
  2011, Danielle Butler, Scars of Eternity, page 30
4. From one side to the other within (a space being traversed).
  Quotations
  I corralled the judge, and we started off across the fields, in no very mild state of fear of that gentleman's wife, whose vigilance was seldom relaxed. And thus we came by a circuitous route to Mohair, the judge occupied by his own guilty thoughts, and I by others not less disturbing.
  1897 December (indicated as 1898), Winston Churchill, chapter VIII, in The Celebrity: An Episode, New York, N.Y.: The Macmillan Company; London: Macmillan & Co., Ltd.
5. At or near the far end of (a space).
  Quotations
  "Mam's baking and Cathleen's asleep. I've got a pile of washing bubbling in the copper, so I'd best be off." With that she was across the room and out the door.
  2004, Josephine Cox, Lovers and Liars‎, page 78
6. Spanning.
7. Throughout.
  Quotations
  Last spring, the periodical cicadas emerged across eastern North America. Their vast numbers and short above-ground life spans inspired awe and irritation in humans—and made for good meals for birds and small mammals.
  2012 March-April, Anna Lena Phillips, “Sneaky Silk Moths”, in American Scientist, volume 100, number 2, page 172
  Across Japan, technology companies and private investors are racing to install devices that until recently they had little interest in: solar panels. Massive solar parks are popping up as part of a rapid build-up that one developer likened to an "explosion."
  2013 June 21, Chico Harlan, “Japan pockets the subsidy …”, in The Guardian Weekly, volume 189, number 2, page 30
8. So as to intersect or pass through or over at an angle.
  Quotations
  He parked across the end of the driveway, blocking her in.
  2010, Alex Bledsoe, The Girls with Games of Blood‎, Tor, page 147
9. In possession of full, up-to-date information about; abreast of.
  Quotations
  As a regular news reader I thought I was across the eccentricities of the US president.
  2019 September 20, Lenore Taylor, The Guardian
adverb
not comparable
1. From one side to the other.
  Quotations
  [The researchers] noticed many of their pieces of [plastic marine] debris sported surface pits around two microns across. Such pits are about the size of a bacterial cell. Closer examination showed that some of these pits did, indeed, contain bacteria, […].
  2013 July 20, “Welcome to the plastisphere”, in The Economist, volume 408, number 8845
2. On the other side.
3. In a particular direction.
4. (crosswords) Horizontally.
noun
plural acrosses
1. (crosswords, often in combination) A word that runs horizontally in the completed puzzle grid or its associated clue.