Cross

A geometrical figure consisting of two straight lines or bars intersecting each other such that at least one of them is bisected by the other.

"Put a cross for a wrong answer and a tick for a right one."

Any geometric figure having this or a similar shape, such as a cross of Lorraine or a Maltese cross.

A wooden post with a perpendicular beam attached and used (especially in the Roman Empire) to execute criminals (by crucifixion).

"Criminals were commonly executed on a wooden cross."

(usually with the) The cross on which Christ was crucified.

To make or form a cross.

To move relatively.

(social) To oppose.

To cross-fertilize or crossbreed.

"They managed to cross a sheep with a goat."

Transverse; lying across the main direction.

"At the end of each row were cross benches which linked the rows."

Opposite, opposed to.

"His actions were perversely cross to his own happiness."

Opposing, adverse; being contrary to what one would hope or wish for.

Bad-tempered, angry, annoyed.

"Please don't get cross at me. (or) Please don't get cross with me."

Across

"She walked cross the mountains."

Cross product of the previous vector and the following vector.

"The Lorentz force is q times v cross B."