(games) A children's game where players must carry out only those commands that are preceded by the utterance "Simon says".

(grammar) A sentence that contains one independent clause and no dependent clause.

plural of simple sentence

(topology) The state of being simply connected.

(topology) The state of being simply connected.

(topology, of a topological space) Having its fundamental group a singleton.

Lacking subtlety or sophistication. / Lacking mental capacity; feeble-minded.

simple past

Alternative spelling of simonize

Clearly, without any doubt or complexity.