Scientific English

ad hoc 

for the special purpose or end

anno Domini (A.D.) 

in the year of our Lord; a date after Christ

ante meridiem (a.m.) 

before noon

post meridiem (p.m.) 

after noon

circa (ca.) 

about; used especially in approximate dates

et alia (et al.) 

and others; and elsewhere

et cetera (etc.) 

and others; and so forth; and so on

exempli gratia (e.g.) 

for example; such as

ibidem (ibid.) 

in the aformentioned place

idem 

the same as previously given

id est (i.e.) 

that is

in situ 

a. in place or position; undisturbed; b. in a localized state or condition

ex situ 

the opposite of in situ

opere citato (op. cit.) 

in the work cited (In other words, op. cit. means that you don't know the page number.)

sic 

thus; so. Used to indicate that a surprising word in the text is not a mistake or is quoted verbatim.

vice versa 

conversely; in reverse order from that stated

vide 

see

vide ante 

see before

vide infra 

see below

vide post 

see after

vide supra 

see above

videlicet (viz.) 

that is to say; namely