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Definitions of relational database:

A database system in which the database is organized and accessed according to the relationships between data items without the need for any consideration of physical orientation and relationship. Relationships between data items are expressed by means of tables.
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(1) A data structure organized so that it is perceived by its users as a collection of tables. (2) A database that is organized and accessed according to relations. T. A relational database has the flexibility to generate new tables from existing records that meet specified criteria.
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A method of structuring data as collections of tables that are logically associated to each other by shared attributes. Any data element can be found in a relation by knowing the name of the table, the attribute (column) name, and the value of the primary key. See also relate, relate key, and relational join.
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A database that stores data in a structure consisting of one or more tables of rows and columns, which may be interconnected. A row corresponds to a record (tuple); columns correspond to attributes (fields) in the record. Typically use Structured Query Language (SQL) for data definition, data management, and data access and retrieval.
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A database built using the relational model, based on tables linked by a common key. Relational databases do not have any predefined access paths, and the order of records within each table is arbitrary.
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A database in the form of tables which have rows and columns to show the relationship between items, and in which information can be cross-referenced between two or more tables to generate a third table. A query language is used to search for data. If data is changed in one table, it will be changed in all related tables. IBM's AS/400's represent one of the state of the art relational database mini computer systems.
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A relational database is organised into tables, in which data is defined so that it can be reorganised and accessed in a number of different ways without having to reorganise the database tables.
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a database where data are stored in more than one table, each one containing different types of data. The different tables can be linked so that information from the separate files can be used together.
nces.ed.gov/pubs98/tech/glossary.asp
Database organized and cross-referenced in rows and columns. Also, a software program that allows users to obtain information drawn from two or more databases that are made up of two-dimensional arrays of data. Not a hierarchical database. Retail Inventory: Inventory counted/extended using retail prices rather than actual prices or cost.
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a database that allows descriptive information to be entered in the same database as geographic information.
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A database where all information is arranged in tables containing predefined fields. Using structured query language, reports and comparisons can be generated by selecting fields of interest from the original database and creating new tables. Changing a field in one record automatically changes the same record in all related databases, allowing for easy global updating.
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A Relational database is a tool which can help you store, manage and disseminate information of various kinds. It is a collection of objects, tables, queries, forms, reports, macros, all stored in a computer program all of which are inter-related.
faculty.washington.edu/~larsson/conf/aiha98/primer/glossary.htm
a database that is made up of normalized tables. Many logical links between tables are declared, but links can be made that were not predetermined when the database was originally designed.
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A database structure composed of more than one flat file (2-dimensional arrays) that can be transformed to form new combinations because of relations between the data in the records, in contrast to hierarchical and network database structures.
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A method of structuring data in the form of records so that relations between different entities and attributes can be used for data access and transformation.
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Data stored in a structure of rows and columns
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A database with the capability to relate information in different data files using a common record (primary) key.
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A database that stores its information in two-dimensional tables (relations) that can be joined by using common data elements in one or more columns (attributes).
docs.rinet.ru/O8/glossary.htm
Relational databases are at the heart of the data warehouse. Data and relations between them are organized into tables—collections of records with each entry containing the same fields. Some fields are designated as keys, so that searches indexed by specific values for key fields retrieve data rapidly. Records in different tables may be linked if they have the same value in a certain field. Examples are Sybase, Informix, OLEDB, SQL server, and Oracle.
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A database designed according to the relational model, which uses the discipline of Entity-Relationship modeling and the data design standards called normal forms.
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A database schema in which information is linked by common fields between several tables.
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A database that contains multiple tables and other objects and has the information organized by defined relationships between tables.
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A somewhat complex database which uses several tables that relate to each other in some way.
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A collection of data files with at least one field in common, so that there is a means of relating any number of data units by using a common factor.
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Databases that contain numerous files that share one or more keys. Relational databases allow for the data to be arranged in different combinations.
www.personal.psu.edu/users/b/e/bea121/GIS_Glossary.html
a database in which relations between information items are explicitly specified as accessible attributes; "in a relational database the data are organized as a number of differently sized tables"
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A relational database is a database based on the relational model. Strictly speaking the term refers to a specific collection of data but it is often used synonymously with the software that is used to manage that collection of data. That software is more correctly called a relational database management system, or RDBMS.
en.wikipedia.org/wiki/Relational_database

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