acertener

== Old French == === Etymology === a- +‎ certener, from the adjective certain, from Vulgar Latin *certānus. === Verb === acertener to assure; to make sure of, to make certain of ==== Conjugation ==== This verb conjugates as a first-group verb ending in -er. Old French conjugation varies significantly by date and by region. The following conjugation should be treated as a guide. ==== Descendants ==== → English: ascertain