ESTA

Electronic System for Travel Authorization (ESTA) is an automated system that determines the eligibility of visitors (nationals from 37 participating countries) to travel to the United States without a visa under the Visa Waiver Program (VWP). A valid ESTA approval is required for all VWP travel to the United States. ESTA applications may be submit...
Found on http://travel.state.gov/content/visas/english/general/glossary.html

Esta

Esta is a cultivated variety of potato.
Found on http://www.probertencyclopaedia.com/browse/QE.HTM

esta

this
Found on http://www.spanishpronto.com/spanishpronto/spanishglossary.html
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