In metadata, the term data element is an atomic unit of data that has precise meaning or precise semantics. A data element has:

A data dictionary, or metadata repository, as defined in the IBM Dictionary of Computing, is a "centralized repository of information about data such as meaning, relationships to other data, origin, usage, and format".ACM, IBM Dictionary of Computing, 10th edition, 1993 Oracle defines it as a collection of tables with metadata.

<database> A data structure that stores meta-data, i.e. data about data. The term "data dictionary" has several uses. Most generally it is a set of data descriptions that can be shared by several applications. Usually it means a table in a database that stores the names, field types, length, and other characteristics of the fields in the database tables. An active data dictionary is automatically updated as changes occur in the database. A passive data dictionary must be manually updated. In a DBMS, this functionality is performed by the {system catalog}. The data dictionary is a more general software utility used by designers, users, and administrators for information resource management. The data dictionary may maintain information on system hardware, software, documentation, users, and other aspects. Data dictionaries are also used to document the database design process itself and can accumulate meta-data ready to feed into the system catalog. [Does anybody call them "codebooks"?] (2001-04-24)

In mathematics, an element (or member) of a set is any one of the distinct objects that belong to that set.

Under United States law, an element of a crime (or element of an offense) is one of a set of facts that must all be proven to convict a defendant of a crime. Before a court finds a defendant guilty of a criminal offense, the prosecution must present evidence that, even when opposed by any evidence the defense may choose, is credible and sufficient to prove beyond a reasonable doubt that the defendant committed each element of the particular crime charged.

The List of data references for chemical elements is divided into datasheets that give values for many properties of the elements, together with various references. Each datasheet is sequenced by atomic number.

In computing, data (treated as singular, plural, or as a mass noun) is any sequence of one or more symbols. Datum is a single symbol of data.

In computer science, data (treated as singular, plural, or as a mass noun) is any sequence of one or more symbols; datum is a single symbol of data. Data requires interpretation to become information.

Data publishing (also data publication) is the act of releasing research data in published form for use by others. It is a practice consisting in preparing certain data or data set(s) for public use thus to make them available to everyone to use as they wish.

Data cleansing or data cleaning is the process of detecting and correcting (or removing) corrupt or inaccurate records from a record set, table, or database and refers to identifying incomplete, incorrect, inaccurate or irrelevant parts of the data and then replacing, modifying, or deleting the dirty or coarse data. Data cleansing may be performed interactively with data wrangling tools, or as batch processing through scripting or a data quality firewall.