| opening

| operating ratio

| opening balance

| operating reserve

| openly

| operating results

| openness

| operating revenue

| openwork

| operating statement

| opera

| operating surplus

| opera-glass

| operating system

| operand

| operating time

| operand field

| operating trouble

| operate

| operation

| operated

| operation decoder

| operatic

| operation field

| operating

| operational

| operating accounts

| operational capacityies

| operating agency

| operational readiness

| operating capacities

| operational semantics

| operating capital

| operational service

| operating cycle

| operational testing

| operating equipment

| operations analysis

| operating expenses

| operations manager

| operating expensess

| operations research

| operating method

| operative

| operating personnel

| operator

| operating profit

| operator command

| operating rate

| operator error