certatim

From certō (“contend, strive”) +‎ -tim (“adverbial marker”).

certātim (not comparable)

1. earnestly, eagerly
2. with rivalry, in competition

• “certatim”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• “certatim”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• certatim in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
• Online Latin dictionary, Olivetti