What is Preact?

Preact definition and meaning on Dictionary terms:
anything done, being done, or to be done; deed; performance: a heroic act.
the process of doing: caught in the act.

a formal decision, law, or the like, by a legislature, ruler, court, or other authority; decree or edict; statute; judgment, resolve, or award: an act of Congress.
an instrument or document stating something done or transacted.
one of the main divisions of a play or opera: the second act of Hamlet.
a short performance by one or more entertainers, usually part of a variety show or radio or television program.
the personnel of such a group: The act broke up after 30 years.
false show; pretense; feint: The politician’s pious remarks were all an act.
Philosophy. (in scholasticism) activity in process; operation.the principle or power of operation.form as determining essence.a state of realization, as opposed to potentiality.

verb (used without object)
to do something; exert energy or force; be employed or operative: He acted promptly in the emergency.
to reach, make, or issue a decision on some matter: I am required to act before noon tomorrow.

to operate or function in a particular way; perform specific duties or functions: to act as manager.
to produce an effect; perform a function: The medicine failed to act.
to behave or conduct oneself in a particular fashion: to act well under all conditions.
to pretend; feign: Act interested even if you’re bored.
to perform as an actor: He acted in three plays by Moli