conventional

Definitions:

Settled by stipulation or by tacit consent; as sanctioned and currently accepted by tacit agreement; agreeable to accepted standards; agreeable to contract.
- Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914. (adjective) (adj.) (adjective)
Customary; tacitly understood.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (adjective) (adj.) (adjective)
Agreed on; customary.
- The Clarendon dictionary. By William Hand Browne, Samuel Stehman Haldeman. Published 1894. (adjective) (adj.) (adjective)
Formed by convention: growing out of tacit agreement or custom: customary.
- The american dictionary of the english language. By Daniel Lyons. Published 1899. (adjective) (adj.) (adjective)
Formal; sanctioned by custom or tradition; based on accepted rules; in art, following fixed rules in design, technique, etc.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (adjective) (adj.) (adjective)
Conventionally.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (adverb) (adv.) (adverb)

Usage examples:

She would think he was making conventional love to her, and his instinct forbade such an obvious beginning.
- The Mayor of Warwick by Herbert M. Hopkins
" 'Don't let us be conventional ' I went on, 'It wouldn't fit in with these wonderful days a bit.
- War and the Weird by Forbes Phillips R. Thurston Hopkins
We are here speaking of real times, and not of the conventional times.
- Astronomy for Amateurs by Camille Flammarion