diag

As a verb know is

(lb) to perceive the truth or factuality of; to be certain of or that.

As a noun know is

knowledge; the state of knowing.

As a noun portal

is portal (grandiose and often lavish entrance).

As a noun diad

is (chemistry) a sequence of two (different) monomers in a polymer.

Diag is likely misspelled.

Diag has no English definition.

As a noun dial is

a graduated, circular scale over which a needle moves to show a measurement (such as speed).

As a verb dial is

to measure or indicate something with a dial.

As an initialism dag

is deputy attorney general in several nations’ federal governments.

As a verb drag

is to pull along a surface or through a medium, sometimes with difficulty.

As a noun drag

is (uncountable) resistance of the air (or some other fluid) to something moving through it or drag can be (uncountable|slang) women's clothing worn by men for the purpose of entertainment.

Diag is often a misspelling of dig.

Diag has no English definition.

As a verb dig

is to move hard-packed earth out of the way, especially downward to make a hole with a shovel. Or to drill, or the like, through rocks, roads, or the like. More generally, to make any similar hole by moving material out of the way.

As a noun dig

is an archeological investigation.