Tell v. t. : To mention one by one, or piece by piece; to recount; to enumerate; to reckon; to number; to count; as, to tell money.

Tell v. t. : To utter or recite in detail; to give an account of; to narrate.

Tell v. t. : To make known; to publish; to disclose; to divulge.

Tell v. t. : To give instruction to; to make report to; to acquaint; to teach; to inform.

Tell v. t. : To order; to request; to command.

Tell v. t. : To discern so as to report; to ascertain by observing; to find out; to discover; as, I can not tell where one color ends and the other begins.

Tell v. t. : To make account of; to regard; to reckon; to value; to estimate.

Tell v. i. : To give an account; to make report.

Tell v. i. : To take effect; to produce a marked effect; as, every shot tells; every expression tells.

Tell n. : That which is told; tale; account.

Tell n. : A hill or mound.

Example:
How can you Tell the difference between old and middle english?

Taxonomy
free encyclopedia, hill, city, archaeological site, settlement, city name, settlement mounds, search, North Jordan, accumulation, building materials, proportion, stone, minor extent, phenomenon, spans, 50,000, the Middle East.

Defination from the web:
tell mostly consists of architectural building materials containing a high proportion of stone, mudbrick, or loam as well as (to a minor extent) ... There are about 50,000 visible tells in the Middle East, a testament to the long settlement of the area.[citation needed] ...