no plan survives contact with the enemy
After a plan against an enemy is drafted, there will be unexpected elements from the opposition that will call for improvisation.
noun
The act of touching physically; being in close association.
She mixed furniture with the same fatal profligacy as she mixed drinks, and this outrageous contact between things which were intended by Nature to be kept poles apart gave her an inexpressible thrill.
The establishment of communication (with).
I haven't been in contact with her for years.
In the old days, […] he gave no evidences of genius whatsoever. He never read me any of his manuscripts, […], and therefore my lack of detection of his promise may in some degree be pardoned. But he had then none of the oddities and mannerisms which I hold to be inseparable from genius, and which struck my attention in after days when I came in contact with the Celebrity.
The situation of being within sight of something; visual contact.
If the pilot […] cannot establish visual contact with the ground, he must immediately execute a missed-approach procedure […]
A nodule designed to connect a device with something else.
Touch the contact to ground and read the number again.
Someone who can be contacted, or with whom one is in communication.
Who is the company's contact for sales queries?
The salesperson had a whole binder full of contacts for potential clients.
verb
To touch; to come into physical contact with.
The side of the car contacted the pedestrian.
To establish communication with (something or someone).
I am trying to contact my sister.