Bimonthly, separated is bi-monthly. bi means two, so bimonthly means 2 a month, or 2 times a month.
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Bifocal is a type of corrective lens. Bifocal lenses are divided into two sections, usually the top for seeing far away objects and the bottom for seeing nearby objects.
attest: provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes; "His high fever attested to his illness"; "The buildings in Rome manifest a high level of architectural sophistication"; "This decision demonstrates his sense of fairness" wordnet.princeton.edu/perl/webwn